520215013 has 4 divisors (see below), whose sum is σ = 520320640. Its totient is φ = 520109388.

The previous prime is 520214971. The next prime is 520215029. The reversal of 520215013 is 310512025.

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 a de Polignac number, because none of the positive numbers 2^k-520215013 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 (520215043) 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, 45045 + ... + 55402.

It is an arithmetic number, because the mean of its divisors is an integer number (130080160).

Almost surely, 2^520215013 is an apocalyptic number.

It is an amenable number.

520215013 is a deficient number, since it is larger than the sum of its proper divisors (105627).

520215013 is a wasteful number, since it uses less digits than its factorization.

520215013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105626.

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

The square root of 520215013 is about 22808.2224866385. Note that the first 3 decimals coincide. The cubic root of 520215013 is about 804.2559708435.

Adding to 520215013 its reverse (310512025), we get a palindrome (830727038).

The spelling of 520215013 in words is "five hundred twenty million, two hundred fifteen thousand, thirteen".