520871037931 has 4 divisors (see below), whose sum is σ = 521307645192. Its totient is φ = 520434430672.

The previous prime is 520871037899. The next prime is 520871037959. The reversal of 520871037931 is 139730178025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520871037931 - 2⁵ = 520871037899 is a prime.

It is a super-2 number, since 2×520871037931² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520871037031) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218301841 + ... + 218304226.

It is an arithmetic number, because the mean of its divisors is an integer number (130326911298).

Almost surely, 2^520871037931 is an apocalyptic number.

520871037931 is a deficient number, since it is larger than the sum of its proper divisors (436607261).

520871037931 is a wasteful number, since it uses less digits than its factorization.

520871037931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436607260.

The product of its (nonzero) digits is 317520, while the sum is 46.

The spelling of 520871037931 in words is "five hundred twenty billion, eight hundred seventy-one million, thirty-seven thousand, nine hundred thirty-one".