520656740231 has 4 divisors (see below), whose sum is σ = 520658693352. Its totient is φ = 520654787112.

The previous prime is 520656740221. The next prime is 520656740239. The reversal of 520656740231 is 132047656025.

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-520656740231 is a prime.

It is a super-2 number, since 2×520656740231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520656740239) 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, 498776 + ... + 1135821.

It is an arithmetic number, because the mean of its divisors is an integer number (130164673338).

Almost surely, 2^520656740231 is an apocalyptic number.

520656740231 is a deficient number, since it is larger than the sum of its proper divisors (1953121).

520656740231 is a wasteful number, since it uses less digits than its factorization.

520656740231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1953120.

The product of its (nonzero) digits is 302400, while the sum is 41.

The spelling of 520656740231 in words is "five hundred twenty billion, six hundred fifty-six million, seven hundred forty thousand, two hundred thirty-one".