521413857 has 12 divisors (see below), whose sum is σ = 765919440. Its totient is φ = 341717208.

The previous prime is 521413843. The next prime is 521413861. The reversal of 521413857 is 758314125.

It is not a de Polignac number, because 521413857 - 2⁶ = 521413793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521413157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 490443 + ... + 491504.

It is an arithmetic number, because the mean of its divisors is an integer number (63826620).

Almost surely, 2^521413857 is an apocalyptic number.

It is an amenable number.

521413857 is a deficient number, since it is larger than the sum of its proper divisors (244505583).

521413857 is a wasteful number, since it uses less digits than its factorization.

521413857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982012 (or 982009 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 521413857 is about 22834.4883235863. The cubic root of 521413857 is about 804.8733038780.

The spelling of 521413857 in words is "five hundred twenty-one million, four hundred thirteen thousand, eight hundred fifty-seven".