1237

1237 is the natural number that follows 1236 and precedes 1238. It is an odd, four-digit prime. Its primality can be verified by testing divisibility with primes up to 31; it has no divisors other than 1 and itself. The sum of its digits is 13. In Roman numerals, 1237 is MCCXXXVII. In binary it is 10011010101; in octal it is 2325; in hexadecimal it is 0x4D5. The square of 1237 is 1,530,169.

As a calendar year, 1237 falls in the 13th century. During this period, various regions experienced the political, military, and cultural dynamics typical of the High Middle Ages, including dynastic conflicts, imperial expansion, and growing exchanges across Eurasia.

In broader mathematical use, 1237 is a prime number, which means it has exactly two distinct positive divisors: 1 and itself. Its status as a prime makes it a candidate in discussions of primality testing and modular arithmetic, and it often appears in examples illustrating basic properties of primes among four-digit integers.