8129

8129 is a natural number that comes after 8128 and before 8130. In mathematics, it is an odd composite number with prime factorization 11 × 739, so its divisors are 1, 11, 739, and 8129.

The sum of all divisors of 8129 is 8880, which yields a sum of proper divisors equal to 751. This shows that 8129 is a deficient number. Its factorization also confirms that it is not a prime; it is divisible by 11, and the cofactor 739 is itself a prime.

8128, the nearest four-digit number, is a famous perfect number, and 8129 sits immediately after it. As a result, 8129 is notable mainly for its distance from this known landmark in number theory, rather than for possessing unique mathematical properties.