520311399 has 4 divisors (see below), whose sum is σ = 693748536. Its totient is φ = 346874264.

The previous prime is 520311377. The next prime is 520311439. The reversal of 520311399 is 993113025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520311399 - 2⁷ = 520311271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520311329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86718564 + ... + 86718569.

It is an arithmetic number, because the mean of its divisors is an integer number (173437134).

Almost surely, 2^520311399 is an apocalyptic number.

520311399 is a deficient number, since it is larger than the sum of its proper divisors (173437137).

520311399 is a wasteful number, since it uses less digits than its factorization.

520311399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173437136.

The product of its (nonzero) digits is 7290, while the sum is 33.

The square root of 520311399 is about 22810.3353548342. The cubic root of 520311399 is about 804.3056389147.

It can be divided in two parts, 520311 and 399, that added together give a triangular number (520710 = T₁₀₂₀).

The spelling of 520311399 in words is "five hundred twenty million, three hundred eleven thousand, three hundred ninety-nine".