520221231 has 16 divisors (see below), whose sum is σ = 783763200. Its totient is φ = 340934904.

The previous prime is 520221217. The next prime is 520221253. The reversal of 520221231 is 132122025.

520221231 is a `hidden beast` number, since 520 + 22 + 123 + 1 = 666.

It is not a de Polignac number, because 520221231 - 2⁷ = 520221103 is a prime.

It is a super-2 number, since 2×520221231² = 541260258366310722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520221281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161691 + ... + 164876.

It is an arithmetic number, because the mean of its divisors is an integer number (48985200).

Almost surely, 2^520221231 is an apocalyptic number.

520221231 is a deficient number, since it is larger than the sum of its proper divisors (263541969).

520221231 is a wasteful number, since it uses less digits than its factorization.

520221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326635 (or 326629 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 520221231 is about 22808.3587967219. The cubic root of 520221231 is about 804.2591751876.

Adding to 520221231 its reverse (132122025), we get a palindrome (652343256).

The spelling of 520221231 in words is "five hundred twenty million, two hundred twenty-one thousand, two hundred thirty-one".