520411631 has 4 divisors (see below), whose sum is σ = 526999200. Its totient is φ = 513824064.

The previous prime is 520411621. The next prime is 520411637. The reversal of 520411631 is 136114025.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520411631 is a prime.

It is a super-2 number, since 2×520411631² = 541656531360160322, 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 = 520411597 and 520411606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520411637) 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, 3293666 + ... + 3293823.

It is an arithmetic number, because the mean of its divisors is an integer number (131749800).

Almost surely, 2^520411631 is an apocalyptic number.

520411631 is a deficient number, since it is larger than the sum of its proper divisors (6587569).

520411631 is an equidigital number, since it uses as much as digits as its factorization.

520411631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6587568.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 520411631 is about 22812.5323232648. The cubic root of 520411631 is about 804.3572823388.

Adding to 520411631 its reverse (136114025), we get a palindrome (656525656).

The spelling of 520411631 in words is "five hundred twenty million, four hundred eleven thousand, six hundred thirty-one".