520813331 has 2 divisors, whose sum is σ = 520813332. Its totient is φ = 520813330.

The previous prime is 520813301. The next prime is 520813333. The reversal of 520813331 is 133318025.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520813331 is a prime.

It is a super-2 number, since 2×520813331² = 542493051494631122, which contains 22 as substring.

Together with 520813333, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 520813331.

It is not a weakly prime, because it can be changed into another prime (520813333) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260406665 + 260406666.

It is an arithmetic number, because the mean of its divisors is an integer number (260406666).

Almost surely, 2^520813331 is an apocalyptic number.

520813331 is a deficient number, since it is larger than the sum of its proper divisors (1).

520813331 is an equidigital number, since it uses as much as digits as its factorization.

520813331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 520813331 is about 22821.3349960076. The cubic root of 520813331 is about 804.5641872846.

The spelling of 520813331 in words is "five hundred twenty million, eight hundred thirteen thousand, three hundred thirty-one".