251902 has 16 divisors (see below), whose sum is σ = 455040. Its totient is φ = 102168.

The previous prime is 251897. The next prime is 251903. The reversal of 251902 is 209152.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 251902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251903) by changing a digit.

251902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208 + ... + 739.

It is an arithmetic number, because the mean of its divisors is an integer number (28440).

2²⁵¹⁹⁰² is an apocalyptic number.

251902 is a deficient number, since it is larger than the sum of its proper divisors (203138).

251902 is a wasteful number, since it uses less digits than its factorization.

251902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 251902 is about 501.8983960923. The cubic root of 251902 is about 63.1554070414.

The spelling of 251902 in words is "two hundred fifty-one thousand, nine hundred two".