521625616 has 20 divisors (see below), whose sum is σ = 1035300924. Its totient is φ = 254451200.

The previous prime is 521625613. The next prime is 521625617. The reversal of 521625616 is 616526125.

It can be written as a sum of positive squares in 2 ways, for example, as 201072400 + 320553216 = 14180^2 + 17904^2 .

It is not an unprimeable number, because it can be changed into a prime (521625613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396925 + ... + 398236.

Almost surely, 2^521625616 is an apocalyptic number.

It is an amenable number.

521625616 is a deficient number, since it is larger than the sum of its proper divisors (513675308).

521625616 is a wasteful number, since it uses less digits than its factorization.

521625616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 795210 (or 795204 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 521625616 is about 22839.1246767471. The cubic root of 521625616 is about 804.9822487502.

The spelling of 521625616 in words is "five hundred twenty-one million, six hundred twenty-five thousand, six hundred sixteen".