520731231 has 8 divisors (see below), whose sum is σ = 694874544. Its totient is φ = 346871040.

The previous prime is 520731209. The next prime is 520731269. The reversal of 520731231 is 132137025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-520731231 is a prime.

It is a super-2 number, since 2×520731231² = 542322029877550722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520731031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66450 + ... + 73871.

It is an arithmetic number, because the mean of its divisors is an integer number (86859318).

Almost surely, 2^520731231 is an apocalyptic number.

520731231 is a deficient number, since it is larger than the sum of its proper divisors (174143313).

520731231 is a wasteful number, since it uses less digits than its factorization.

520731231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141561.

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 520731231 is about 22819.5361696946. The cubic root of 520731231 is about 804.5219084186.

Adding to 520731231 its reverse (132137025), we get a palindrome (652868256).

The spelling of 520731231 in words is "five hundred twenty million, seven hundred thirty-one thousand, two hundred thirty-one".