520531031 has 4 divisors (see below), whose sum is σ = 520583712. Its totient is φ = 520478352.

The previous prime is 520531027. The next prime is 520531093. The reversal of 520531031 is 130135025.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 520531031 - 2² = 520531027 is a prime.

It is a super-2 number, since 2×520531031² = 541905108467845922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520530994 and 520531012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520531001) 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, 6575 + ... + 32928.

It is an arithmetic number, because the mean of its divisors is an integer number (130145928).

Almost surely, 2^520531031 is an apocalyptic number.

520531031 is a deficient number, since it is larger than the sum of its proper divisors (52681).

520531031 is a wasteful number, since it uses less digits than its factorization.

520531031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52680.

The product of its (nonzero) digits is 450, while the sum is 20.

The square root of 520531031 is about 22815.1491557693. The cubic root of 520531031 is about 804.4187932081.

Adding to 520531031 its reverse (130135025), we get a palindrome (650666056).

The spelling of 520531031 in words is "five hundred twenty million, five hundred thirty-one thousand, thirty-one".