521385956 has 36 divisors (see below), whose sum is σ = 1129165632. Its totient is φ = 206260704.

The previous prime is 521385947. The next prime is 521385989. The reversal of 521385956 is 659583125.

It is a super-2 number, since 2×521385956² = 543686630228067872, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50360 + ... + 59823.

It is an arithmetic number, because the mean of its divisors is an integer number (31365712).

Almost surely, 2^521385956 is an apocalyptic number.

It is an amenable number.

521385956 is an abundant number, since it is smaller than the sum of its proper divisors (607779676).

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

521385956 is a wasteful number, since it uses less digits than its factorization.

521385956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110220 (or 110205 counting only the distinct ones).

The product of its digits is 324000, while the sum is 44.

The square root of 521385956 is about 22833.8773755138. The cubic root of 521385956 is about 804.8589472908.

The spelling of 521385956 in words is "five hundred twenty-one million, three hundred eighty-five thousand, nine hundred fifty-six".