251992 has 16 divisors (see below), whose sum is σ = 509040. Its totient is φ = 116256.

The previous prime is 251983. The next prime is 252001. The reversal of 251992 is 299152.

251992 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (251983) and next prime (252001).

It is a self number, because there is not a number n which added to its sum of digits gives 251992.

It is a congruent number.

It is an unprimeable number.

251992 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 3 ways as a sum of consecutive naturals, for example, 1108 + ... + 1315.

It is an arithmetic number, because the mean of its divisors is an integer number (31815).

2²⁵¹⁹⁹² is an apocalyptic number.

It is an amenable number.

251992 is an abundant number, since it is smaller than the sum of its proper divisors (257048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

251992 is a wasteful number, since it uses less digits than its factorization.

251992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442 (or 2438 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 251992 is about 501.9880476665. The cubic root of 251992 is about 63.1629275716.

The spelling of 251992 in words is "two hundred fifty-one thousand, nine hundred ninety-two".