520409913 has 8 divisors (see below), whose sum is σ = 705640800. Its totient is φ = 341059488.

The previous prime is 520409881. The next prime is 520409957. The reversal of 520409913 is 319904025.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 520409913 - 2⁵ = 520409881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (520409963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1469908 + ... + 1470261.

It is an arithmetic number, because the mean of its divisors is an integer number (88205100).

Almost surely, 2^520409913 is an apocalyptic number.

It is an amenable number.

520409913 is a deficient number, since it is larger than the sum of its proper divisors (185230887).

520409913 is a wasteful number, since it uses less digits than its factorization.

520409913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2940231.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 520409913 is about 22812.4946684925. The cubic root of 520409913 is about 804.3563972143.

The spelling of 520409913 in words is "five hundred twenty million, four hundred nine thousand, nine hundred thirteen".