251955956 has 12 divisors (see below), whose sum is σ = 503911968. Its totient is φ = 107981112.

The previous prime is 251955953. The next prime is 251955967. The reversal of 251955956 is 659559152.

251955956 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 251955956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251955953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4499186 + ... + 4499241.

It is an arithmetic number, because the mean of its divisors is an integer number (41992664).

Almost surely, 2^251955956 is an apocalyptic number.

It is an amenable number.

251955956 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

251955956 is a wasteful number, since it uses less digits than its factorization.

251955956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8998438 (or 8998436 counting only the distinct ones).

The product of its digits is 607500, while the sum is 47.

The square root of 251955956 is about 15873.1205501628. The cubic root of 251955956 is about 631.5991589784.

The spelling of 251955956 in words is "two hundred fifty-one million, nine hundred fifty-five thousand, nine hundred fifty-six".