521000056 has 16 divisors (see below), whose sum is σ = 977320800. Its totient is φ = 260381184.

The previous prime is 521000033. The next prime is 521000069. The reversal of 521000056 is 650000125.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 520999997 and 521000042.

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, 5400 + ... + 32728.

It is an arithmetic number, because the mean of its divisors is an integer number (61082550).

Almost surely, 2^521000056 is an apocalyptic number.

It is an amenable number.

521000056 is a deficient number, since it is larger than the sum of its proper divisors (456320744).

521000056 is a wasteful number, since it uses less digits than its factorization.

521000056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29718 (or 29714 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 521000056 is about 22825.4256477289. The cubic root of 521000056 is about 804.6603281271.

The spelling of 521000056 in words is "five hundred twenty-one million, fifty-six", and thus it is an aban number.