521000008 has 8 divisors (see below), whose sum is σ = 976875030. Its totient is φ = 260500000.

The previous prime is 520999991. The next prime is 521000021. The reversal of 521000008 is 800000125.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 487614724 + 33385284 = 22082^2 + 5778^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 520999955 and 521000000.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32562493 + ... + 32562508.

Almost surely, 2^521000008 is an apocalyptic number.

It is an amenable number.

521000008 is a deficient number, since it is larger than the sum of its proper divisors (455875022).

521000008 is a wasteful number, since it uses less digits than its factorization.

521000008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65125007 (or 65125003 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 521000008 is about 22825.4245962698. The cubic root of 521000008 is about 804.6603034159.

The spelling of 521000008 in words is "five hundred twenty-one million, eight", and thus it is an aban number.