520321369 has 2 divisors, whose sum is σ = 520321370. Its totient is φ = 520321368.

The previous prime is 520321367. The next prime is 520321379. The reversal of 520321369 is 963123025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 514382400 + 5938969 = 22680^2 + 2437^2 .

It is a cyclic number.

It is not a de Polignac number, because 520321369 - 2¹ = 520321367 is a prime.

It is a super-2 number, since 2×520321369² = 541468654076068322, which contains 22 as substring.

Together with 520321367, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 520321369.

It is not a weakly prime, because it can be changed into another prime (520321367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260160684 + 260160685.

It is an arithmetic number, because the mean of its divisors is an integer number (260160685).

Almost surely, 2^520321369 is an apocalyptic number.

It is an amenable number.

520321369 is a deficient number, since it is larger than the sum of its proper divisors (1).

520321369 is an equidigital number, since it uses as much as digits as its factorization.

520321369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 520321369 is about 22810.5538950723. The cubic root of 520321369 is about 804.3107761435.

The spelling of 520321369 in words is "five hundred twenty million, three hundred twenty-one thousand, three hundred sixty-nine".