251315164 has 12 divisors (see below), whose sum is σ = 443694384. Its totient is φ = 124545344.

The previous prime is 251315153. The next prime is 251315209. The reversal of 251315164 is 461513152.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 277552 + ... + 278455.

It is an arithmetic number, because the mean of its divisors is an integer number (36974532).

Almost surely, 2^251315164 is an apocalyptic number.

It is an amenable number.

251315164 is a deficient number, since it is larger than the sum of its proper divisors (192379220).

251315164 is a wasteful number, since it uses less digits than its factorization.

251315164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556124 (or 556122 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 251315164 is about 15852.9228850708. The cubic root of 251315164 is about 631.0632620337.

The spelling of 251315164 in words is "two hundred fifty-one million, three hundred fifteen thousand, one hundred sixty-four".