520531131 has 4 divisors (see below), whose sum is σ = 694041512. Its totient is φ = 347020752.

The previous prime is 520531129. The next prime is 520531171. The reversal of 520531131 is 131135025.

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

It is not a de Polignac number, because 520531131 - 2¹ = 520531129 is a prime.

It is a super-2 number, since 2×520531131² = 541905316680278322, 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 = 520531098 and 520531107.

It is not an unprimeable number, because it can be changed into a prime (520531111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86755186 + ... + 86755191.

It is an arithmetic number, because the mean of its divisors is an integer number (173510378).

Almost surely, 2^520531131 is an apocalyptic number.

520531131 is a deficient number, since it is larger than the sum of its proper divisors (173510381).

520531131 is a wasteful number, since it uses less digits than its factorization.

520531131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173510380.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 520531131 is about 22815.1513472955. The cubic root of 520531131 is about 804.4188447208.

Adding to 520531131 its reverse (131135025), we get a palindrome (651666156).

The spelling of 520531131 in words is "five hundred twenty million, five hundred thirty-one thousand, one hundred thirty-one".