251129 has 4 divisors (see below), whose sum is σ = 253584. Its totient is φ = 248676.

The previous prime is 251117. The next prime is 251143. The reversal of 251129 is 921152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251129 - 2¹⁶ = 185593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 251129.

It is not an unprimeable number, because it can be changed into a prime (251149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067 + ... + 1280.

It is an arithmetic number, because the mean of its divisors is an integer number (63396).

2²⁵¹¹²⁹ is an apocalyptic number.

It is an amenable number.

251129 is a deficient number, since it is larger than the sum of its proper divisors (2455).

251129 is a wasteful number, since it uses less digits than its factorization.

251129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454.

The product of its digits is 180, while the sum is 20.

The square root of 251129 is about 501.1277282290. The cubic root of 251129 is about 63.0907401587.

The spelling of 251129 in words is "two hundred fifty-one thousand, one hundred twenty-nine".