1129

1129 is a natural number that follows 1128 and precedes 1130. In mathematics, it is notable for being a prime number, meaning its only positive divisors are 1 and itself.

Its digits sum to 13, and it is an odd number. Its primality can be checked by testing potential divisors up to the square root of 1129 (about 33.6); no divisors other than 1 and 1129 are found, confirming its status as a prime.

In common base representations, 1129 is written as 1129 in decimal; in binary it is 10001101001; in octal it is 2151; in hexadecimal it is 469 (often written as 0x469); and in Roman numerals it is MCXXIX.

As a historical year, 1129 CE falls in the 12th century, a period marked by various regional developments in Europe and across the broader world. Chronicles from that era reference politics, religion, and the growth of towns, but specific events attributed to 1129 vary by region and source.

In modern usage, 1129 can serve as a numeric identifier in catalogs, part numbers, or route designations. It may also appear in date formats such as November 29 or 11/29 in contexts where month-first conventions are used.