251920164 has 24 divisors (see below), whose sum is σ = 618751840. Its totient is φ = 79553664.

The previous prime is 251920139. The next prime is 251920169. The reversal of 251920164 is 461029152.

It is not an unprimeable number, because it can be changed into a prime (251920169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 552229 + ... + 552684.

Almost surely, 2^251920164 is an apocalyptic number.

It is an amenable number.

251920164 is an abundant number, since it is smaller than the sum of its proper divisors (366831676).

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

251920164 is a wasteful number, since it uses less digits than its factorization.

251920164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104939 (or 1104937 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 251920164 is about 15871.9930695549. The cubic root of 251920164 is about 631.5692499578.

The spelling of 251920164 in words is "two hundred fifty-one million, nine hundred twenty thousand, one hundred sixty-four".