520642513 has 4 divisors (see below), whose sum is σ = 543279168. Its totient is φ = 498005860.

The previous prime is 520642511. The next prime is 520642531. The reversal of 520642513 is 315246025.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 520642513 - 2¹ = 520642511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520642511) 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, 11318293 + ... + 11318338.

It is an arithmetic number, because the mean of its divisors is an integer number (135819792).

Almost surely, 2^520642513 is an apocalyptic number.

It is an amenable number.

520642513 is a deficient number, since it is larger than the sum of its proper divisors (22636655).

520642513 is a wasteful number, since it uses less digits than its factorization.

520642513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22636654.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 520642513 is about 22817.5921823491. The cubic root of 520642513 is about 804.4762164991.

Adding to 520642513 its reverse (315246025), we get a palindrome (835888538).

The spelling of 520642513 in words is "five hundred twenty million, six hundred forty-two thousand, five hundred thirteen".