520021513 has 16 divisors (see below), whose sum is σ = 593049600. Its totient is φ = 451361680.

The previous prime is 520021511. The next prime is 520021519. The reversal of 520021513 is 315120025.

It is not a de Polignac number, because 520021513 - 2¹ = 520021511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (520021511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165168 + ... + 168286.

It is an arithmetic number, because the mean of its divisors is an integer number (37065600).

Almost surely, 2^520021513 is an apocalyptic number.

It is an amenable number.

520021513 is a deficient number, since it is larger than the sum of its proper divisors (73028087).

520021513 is a wasteful number, since it uses less digits than its factorization.

520021513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3812.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 520021513 is about 22803.9802008334. The cubic root of 520021513 is about 804.1562410358.

Adding to 520021513 its reverse (315120025), we get a palindrome (835141538).

The spelling of 520021513 in words is "five hundred twenty million, twenty-one thousand, five hundred thirteen".