520231816 has 16 divisors (see below), whose sum is σ = 1050468300. Its totient is φ = 240106944.

The previous prime is 520231813. The next prime is 520231823. The reversal of 520231816 is 618132025.

It can be written as a sum of positive squares in 2 ways, for example, as 507600900 + 12630916 = 22530^2 + 3554^2 .

It is a super-2 number, since 2×520231816² = 541282284757315712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (520231813) 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, 2501011 + ... + 2501218.

Almost surely, 2^520231816 is an apocalyptic number.

It is an amenable number.

520231816 is an abundant number, since it is smaller than the sum of its proper divisors (530236484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

520231816 is a wasteful number, since it uses less digits than its factorization.

520231816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5002248 (or 5002244 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 520231816 is about 22808.5908376647. The cubic root of 520231816 is about 804.2646299347.

The spelling of 520231816 in words is "five hundred twenty million, two hundred thirty-one thousand, eight hundred sixteen".