520369 has 2 divisors, whose sum is σ = 520370. Its totient is φ = 520368.

The previous prime is 520363. The next prime is 520379. The reversal of 520369 is 963025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 471969 + 48400 = 687^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 520369 - 2³ = 520361 is a prime.

It is a super-2 number, since 2×520369² = 541567792322, which contains 22 as substring.

520369 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (520361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260184 + 260185.

It is an arithmetic number, because the mean of its divisors is an integer number (260185).

2⁵²⁰³⁶⁹ is an apocalyptic number.

It is an amenable number.

520369 is a deficient number, since it is larger than the sum of its proper divisors (1).

520369 is an equidigital number, since it uses as much as digits as its factorization.

520369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 520369 is about 721.3660651847. The cubic root of 520369 is about 80.4335318000.

The spelling of 520369 in words is "five hundred twenty thousand, three hundred sixty-nine".