521339516 has 12 divisors (see below), whose sum is σ = 918908760. Its totient is φ = 258794160.

The previous prime is 521339453. The next prime is 521339531. The reversal of 521339516 is 615933125.

It is a super-2 number, since 2×521339516² = 543589781886228512, which contains 22 as substring.

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, 468275 + ... + 469386.

It is an arithmetic number, because the mean of its divisors is an integer number (76575730).

Almost surely, 2^521339516 is an apocalyptic number.

It is an amenable number.

521339516 is a deficient number, since it is larger than the sum of its proper divisors (397569244).

521339516 is a wasteful number, since it uses less digits than its factorization.

521339516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 937804 (or 937802 counting only the distinct ones).

The product of its digits is 24300, while the sum is 35.

The square root of 521339516 is about 22832.8604427917. The cubic root of 521339516 is about 804.8350502404.

The spelling of 521339516 in words is "five hundred twenty-one million, three hundred thirty-nine thousand, five hundred sixteen".