1160 (number) 1160 1160 is an even composite integer (2^3·5·29). It has 16 divisors, Euler totient 448, is an abundant Harshad number and equals 34^2 + 2^2. It also serves as a calendar year label.
1161 1161 — the integer and the calendar year (MCLXI). Summary of its arithmetic properties, numeral representations, occurrences, and notable events associated with the year 1161.
1162 1162 as an integer (2·7·83) and as a year in the Julian calendar. Covers mathematical properties, notable historical events of AD 1162, and widely known cultural or chronological r…
1167: the number and the year 1167 Overview of 1167 as an integer and as a calendar year (AD and BC): mathematical properties, historical context for AD 1167, Bronze Age context for 1167 BC, and common usages of the…
1168 — the number and the year: mathematical traits and historical context 1168 A concise reference for 1168: integer properties (factorization, divisors, representations) and the broader historical context of the year 1168 CE in the 12th century.
1169 (number and year) 1169 Overview of 1169 as an integer and as the year AD 1169: mathematical properties, historical events of the High Middle Ages, and notable distinctions.
1171 — the integer and the year: mathematical properties and historical highlights 1171 An overview of 1171 as a number (mathematical features and numeral representations) and as a calendar year (notable events such as the end of the Fatimid Caliphate and Henry II's e…
1173 (integer and year) 1173 1173 is an odd composite integer (3 × 17 × 23), a sphenic and deficient number. Properties include eight divisors, φ(1173)=704 and σ(1173)=1728. Also the year 1173 AD (MCLXXIII) ma…
1175 (number and year) 1175 Overview of 1175 as an integer and as a calendar year: mathematical properties, number‑theoretic features, historical context in the 12th century and common modern uses.
1178 (number and year) 1178 A concise reference to 1178: its arithmetic properties, divisor data and numeral forms, together with context for the calendar year AD 1178 and the notable medieval lunar sighting…
1179 — number and year 1179 1179 is an integer and a calendar year. As a number it equals 9×131 and has six divisors; as AD 1179 it saw the Third Lateran Council and military actions in the Crusader states, a…
1182: the Number and the Year 1182 An overview of the integer 1182 and the year AD 1182, with mathematical properties, major historical events — notably the Massacre of the Latins in Constantinople — and wider histo…
1184 (number and year) 1184 Overview of 1184 as an integer and as a historical year: mathematical properties, divisors and amicable pair, and notable chronological references including the traditional date fo…
1185 (number and year) 1185 1185 is an odd composite integer (3×5×79) with several notable arithmetic properties. As a year, AD 1185 saw the Battle of Dan-no-ura and the close of Japan's Genpei War.
12 (number) Twelve is the integer after eleven and before thirteen. An even composite number with six divisors, it forms the basis of the dozen and has broad mathematical, cultural, and histor…
12-hour clock A system that divides the day into two 12-hour periods labeled a.m. and p.m., commonly used in everyday speech and many countries; contrasted with the 24-hour clock for clarity and…
1218 (number and year) 1218 Overview of 1218 as an integer (factorization, divisors, representations) and as the year AD 1218 in the High Middle Ages, including the Fifth Crusade and broader historical contex…
1219 — the integer and the year AD 1219 Overview of 1219 as an integer (basic number‑theory properties and representations) and as the historical year AD 1219, with broadly known events and common uses.
1220 — the number and the year AD 1220 1220 Overview of 1220 as an integer (mathematical properties and representations) and as the calendar year AD 1220, including major medieval events and architectural developments.
1221 — the number and the year 1221 Compact article on 1221: its mathematical properties, numeral representations and divisors, brief historical context for the year 1221, and common usages of the numeral.
1222 (number and year) 1222 An overview of 1222 as an integer and of the calendar year AD 1222, covering mathematical properties, notable historical events like the University of Padua and the Golden Bull of…
1224 (number and year) 1224 Overview of 1224 as an integer and as a calendar year: mathematical properties, representations, and notable historical events commonly associated with the year AD 1224.
1225 (number and year) 1225 1225 is a number notable as 35² and a triangular number. As the year AD 1225 it saw the reissue of Magna Carta and dynastic manoeuvres in Europe and the Crusader states amid wider…
1226 — the number and the year 1226 Overview of 1226 as an integer (mathematical properties, factorization, classifications) and as a calendar year (notable events and historical context).
1228 (number and year) 1228 Overview of 1228 as an integer and as a calendar year: mathematical properties, representations, and notable historical events such as the Sixth Crusade and the canonization of Sai…
1231 (number and year) 1231 Overview of 1231 as an integer and as the year AD 1231: numeric properties, representations, and notable historical events in the High Middle Ages.
1234 (number) 1234 1234 is an even four-digit integer notable as a semiprime (2 × 617), a sequence of ascending digits, and for a range of numeral representations and cultural uses.
1235 The integer 1235: its mathematical properties, representations, and a brief note on the year 1235 (MCCXXXV) in historical context.
1244 (year and integer) 1244 Overview of the year 1244 and the integer 1244: key historical events, regional consequences, and basic mathematical properties.
1245 (number and year) 1245 Overview of 1245 as an integer and as a calendar year: mathematical properties, common representations, historical highlights from AD 1245, and notable facts.
1246 — integer properties and the year 1246 1246 1246 is an even composite integer (2 × 7 × 89) and a calendar year in the 13th century. This article summarizes its arithmetic properties, representations, divisors, classification…
1250 1250 as an integer and a historical year: mathematical properties, numeral systems and representations, and notable events around 1250 CE and 1250 BCE in broad historical context.
1252 (number and year) 1252 Combined overview of 1252 as an integer (mathematical properties, representations) and as a calendar year (Julian leap year, mid-13th century context).
1253 (number) 1253 1253 is a positive integer, a composite semiprime equal to 7 × 179. This article summarizes its arithmetic properties, representations (binary, hexadecimal, Roman), and common cont…
1255: number properties and historical context 1255 Overview of 1255 as an integer and a year: mathematical characteristics, representations, and the broad historical setting of 1255 AD and 1255 BC.
1256 (number and year) 1256 An overview of the integer 1256—its arithmetic properties, representations, and occurrences—and a brief note on notable events of the year AD 1256.
1257 1257 as an integer and as the year AD 1257: mathematical properties, numeral representations, and the historical and climatic significance of a major mid-13th-century volcanic erup…
1258 (year and number) 1258 1258 denotes both a calendar year notable for the Mongol sack of Baghdad and a composite integer (2 × 17 × 37) with several elementary arithmetic properties.
1259 (number and year) 1259 1259 is a natural number with distinct mathematical properties and a historically significant year (AD 1259) notable for the Treaty of Paris and the death of Möngke Khan.
1260 — the integer and its notable historical references 1260 Overview of 1260 as an integer (factors, divisor properties, classifications) and its appearances in history and cultural contexts, including the year AD 1260 and prophetic usage.
1262 — the number and the year 1262 Overview of 1262 as an integer and the year AD 1262: mathematical features, historical context (including Iceland's Old Covenant), uses and notable distinctions.
1263 (number and year) 1263 Overview of 1263 as an integer (arithmetical properties and representations) and as a historical year in the mid‑13th century, with key events and broader context.
1265 (number and year) 1265 Summary of 1265 as an integer and the year AD 1265: mathematical properties, representations, historical events, and notable distinctions.
1267 (number and year) 1267 An encyclopedic overview of 1267: mathematical characteristics of the integer, representations and classifications, and brief context for the calendar year 1267 AD.
1269 (number and calendar year) 1269 1269 is an odd composite integer (3^3·47) with eight divisors and totient 828; as a calendar year (MCCLXIX) it falls in the High Middle Ages and reflects 13th‑century political and…
1272 (number and year) 1272 Overview of 1272 as an integer and as a historical year: mathematical properties, key events of AD 1272, and other notable uses and distinctions.
1275: the number and the year AD 1275 1275 Overview of 1275 as an integer and as a calendar year in the 13th century: mathematical properties, historical context, notable events such as the Statute of Westminster, and cultu…
1276 — the integer and the year AD 1276 1276 Overview of 1276 as a number (arithmetic properties, representations) and as a calendar year (notable events, historical context, distinctions).
