251128992 has 48 divisors (see below), whose sum is σ = 667578240. Its totient is φ = 82647552.

The previous prime is 251128991. The next prime is 251129003. The reversal of 251128992 is 299821152.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 251128992.

It is not an unprimeable number, because it can be changed into a prime (251128991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8973 + ... + 24140.

It is an arithmetic number, because the mean of its divisors is an integer number (13907880).

Almost surely, 2^251128992 is an apocalyptic number.

It is an amenable number.

251128992 is an abundant number, since it is smaller than the sum of its proper divisors (416449248).

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

251128992 is a wasteful number, since it uses less digits than its factorization.

251128992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33205 (or 33197 counting only the distinct ones).

The product of its digits is 25920, while the sum is 39.

The square root of 251128992 is about 15847.0499462834. The cubic root of 251128992 is about 630.9073948871.

The spelling of 251128992 in words is "two hundred fifty-one million, one hundred twenty-eight thousand, nine hundred ninety-two".