521531312 has 20 divisors (see below), whose sum is σ = 1010883216. Its totient is φ = 260658240.

The previous prime is 521531251. The next prime is 521531327. The reversal of 521531312 is 213135125.

It is a happy 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, 45773 + ... + 56019.

Almost surely, 2^521531312 is an apocalyptic number.

It is an amenable number.

521531312 is a deficient number, since it is larger than the sum of its proper divisors (489351904).

521531312 is a wasteful number, since it uses less digits than its factorization.

521531312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13436 (or 13430 counting only the distinct ones).

The product of its digits is 900, while the sum is 23.

The square root of 521531312 is about 22837.0600559704. The cubic root of 521531312 is about 804.9337352705.

Adding to 521531312 its reverse (213135125), we get a palindrome (734666437).

The spelling of 521531312 in words is "five hundred twenty-one million, five hundred thirty-one thousand, three hundred twelve".