521252904 has 16 divisors (see below), whose sum is σ = 1303132320. Its totient is φ = 173750960.

The previous prime is 521252899. The next prime is 521252939. The reversal of 521252904 is 409252125.

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, 10859412 + ... + 10859459.

It is an arithmetic number, because the mean of its divisors is an integer number (81445770).

Almost surely, 2^521252904 is an apocalyptic number.

It is an amenable number.

521252904 is an abundant number, since it is smaller than the sum of its proper divisors (781879416).

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

521252904 is a wasteful number, since it uses less digits than its factorization.

521252904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21718880 (or 21718876 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 521252904 is about 22830.9637115913. The cubic root of 521252904 is about 804.7904777294.

The spelling of 521252904 in words is "five hundred twenty-one million, two hundred fifty-two thousand, nine hundred four".