520405331 has 2 divisors, whose sum is σ = 520405332. Its totient is φ = 520405330.

The previous prime is 520405321. The next prime is 520405351. The reversal of 520405331 is 133504025.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 520405331 - 2¹⁸ = 520143187 is a prime.

It is a super-2 number, since 2×520405331² = 541643417066439122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 520405297 and 520405306.

It is not a weakly prime, because it can be changed into another prime (520405321) 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 as a sum of consecutive naturals, namely, 260202665 + 260202666.

It is an arithmetic number, because the mean of its divisors is an integer number (260202666).

Almost surely, 2^520405331 is an apocalyptic number.

520405331 is a deficient number, since it is larger than the sum of its proper divisors (1).

520405331 is an equidigital number, since it uses as much as digits as its factorization.

520405331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 520405331 is about 22812.3942408507. The cubic root of 520405331 is about 804.3540365291.

Adding to 520405331 its reverse (133504025), we get a palindrome (653909356).

The spelling of 520405331 in words is "five hundred twenty million, four hundred five thousand, three hundred thirty-one".