521086408 has 8 divisors (see below), whose sum is σ = 977037030. Its totient is φ = 260543200.

The previous prime is 521086393. The next prime is 521086411. The reversal of 521086408 is 804680125.

It can be written as a sum of positive squares in only one way, i.e., 364886404 + 156200004 = 19102^2 + 12498^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32567893 + ... + 32567908.

Almost surely, 2^521086408 is an apocalyptic number.

It is an amenable number.

521086408 is a deficient number, since it is larger than the sum of its proper divisors (455950622).

521086408 is a wasteful number, since it uses less digits than its factorization.

521086408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65135807 (or 65135803 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 521086408 is about 22827.3171441587. The cubic root of 521086408 is about 804.7047812191.

The spelling of 521086408 in words is "five hundred twenty-one million, eighty-six thousand, four hundred eight".