520231331 has 4 divisors (see below), whose sum is σ = 550833192. Its totient is φ = 489629472.

The previous prime is 520231277. The next prime is 520231409. The reversal of 520231331 is 133132025.

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-520231331 is a prime.

It is a super-2 number, since 2×520231331² = 541281275508063122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520231531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15300905 + ... + 15300938.

It is an arithmetic number, because the mean of its divisors is an integer number (137708298).

Almost surely, 2^520231331 is an apocalyptic number.

520231331 is a deficient number, since it is larger than the sum of its proper divisors (30601861).

520231331 is a wasteful number, since it uses less digits than its factorization.

520231331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30601860.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 520231331 is about 22808.5802057033. The cubic root of 520231331 is about 804.2643800022.

Adding to 520231331 its reverse (133132025), we get a palindrome (653363356).

The spelling of 520231331 in words is "five hundred twenty million, two hundred thirty-one thousand, three hundred thirty-one".