1231

1231 is a positive integer that follows 1230 and precedes 1232. In mathematics it is a prime number, meaning it has no divisors other than 1 and itself. It is odd and its digits sum to 7. In common numeral representations it appears as decimal 1231, binary 10011001111, and hexadecimal 0x4CF. Its Roman numeral form is MCCXXXI.

As a calendar year, 1231 CE falls in the 13th century. In historical terms, it sits within the broader period of the High Middle Ages in Europe and the shared Eurasian context of that era, a time marked by diverse political, cultural, and economic developments across different regions.

In other uses, 1231 may appear as a numeric identifier in catalogs, model numbers, inventory codes, or postal and administrative designations. Like many integers, it serves as a convenient label in various technical, mathematical, and everyday contexts.