521064172 has 48 divisors (see below), whose sum is σ = 971841024. Its totient is φ = 243936000.

The previous prime is 521064169. The next prime is 521064209. The reversal of 521064172 is 271460125.

It is a self number, because there is not a number n which added to its sum of digits gives 521064172.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1574047 + ... + 1574377.

It is an arithmetic number, because the mean of its divisors is an integer number (20246688).

Almost surely, 2^521064172 is an apocalyptic number.

It is an amenable number.

521064172 is a deficient number, since it is larger than the sum of its proper divisors (450776852).

521064172 is a wasteful number, since it uses less digits than its factorization.

521064172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 521064172 is about 22826.8300909259. The cubic root of 521064172 is about 804.6933348321.

The spelling of 521064172 in words is "five hundred twenty-one million, sixty-four thousand, one hundred seventy-two".