520013999 has 4 divisors (see below), whose sum is σ = 521220960. Its totient is φ = 518807040.

The previous prime is 520013941. The next prime is 520014031. The reversal of 520013999 is 999310025.

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 520013999 - 2²⁸ = 251578543 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 (520013929) 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, 602834 + ... + 603695.

It is an arithmetic number, because the mean of its divisors is an integer number (130305240).

Almost surely, 2^520013999 is an apocalyptic number.

520013999 is a deficient number, since it is larger than the sum of its proper divisors (1206961).

520013999 is a wasteful number, since it uses less digits than its factorization.

520013999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1206960.

The product of its (nonzero) digits is 21870, while the sum is 38.

The square root of 520013999 is about 22803.8154482972. The cubic root of 520013999 is about 804.1523678248.

The spelling of 520013999 in words is "five hundred twenty million, thirteen thousand, nine hundred ninety-nine".