520331999 has 16 divisors (see below), whose sum is σ = 590392320. Its totient is φ = 454390560.

The previous prime is 520331951. The next prime is 520332017. The reversal of 520331999 is 999133025.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 520331999 - 2⁸ = 520331743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520330999) 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 in 15 ways as a sum of consecutive naturals, for example, 24062 + ... + 40244.

It is an arithmetic number, because the mean of its divisors is an integer number (36899520).

Almost surely, 2^520331999 is an apocalyptic number.

520331999 is a deficient number, since it is larger than the sum of its proper divisors (70060321).

520331999 is a wasteful number, since it uses less digits than its factorization.

520331999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16310.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 520331999 is about 22810.7869000611. The cubic root of 520331999 is about 804.3162533772.

The spelling of 520331999 in words is "five hundred twenty million, three hundred thirty-one thousand, nine hundred ninety-nine".