520213513 has 4 divisors (see below), whose sum is σ = 538151940. Its totient is φ = 502275088.

The previous prime is 520213487. The next prime is 520213543. The reversal of 520213513 is 315312025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 270668304 + 249545209 = 16452^2 + 15797^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520213513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520213543) 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, 8969170 + ... + 8969227.

It is an arithmetic number, because the mean of its divisors is an integer number (134537985).

Almost surely, 2^520213513 is an apocalyptic number.

It is an amenable number.

520213513 is a deficient number, since it is larger than the sum of its proper divisors (17938427).

520213513 is a wasteful number, since it uses less digits than its factorization.

520213513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17938426.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 520213513 is about 22808.1896037366. The cubic root of 520213513 is about 804.2551978394.

Adding to 520213513 its reverse (315312025), we get a palindrome (835525538).

The spelling of 520213513 in words is "five hundred twenty million, two hundred thirteen thousand, five hundred thirteen".