520308013 has 2 divisors, whose sum is σ = 520308014. Its totient is φ = 520308012.

The previous prime is 520307981. The next prime is 520308031. The reversal of 520308013 is 310803025.

Together with next prime (520308031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 498048489 + 22259524 = 22317^2 + 4718^2 .

It is a cyclic number.

It is not a de Polignac number, because 520308013 - 2⁵ = 520307981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520308073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260154006 + 260154007.

It is an arithmetic number, because the mean of its divisors is an integer number (260154007).

Almost surely, 2^520308013 is an apocalyptic number.

It is an amenable number.

520308013 is a deficient number, since it is larger than the sum of its proper divisors (1).

520308013 is an equidigital number, since it uses as much as digits as its factorization.

520308013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 520308013 is about 22810.2611339721. The cubic root of 520308013 is about 804.3038942001.

The spelling of 520308013 in words is "five hundred twenty million, three hundred eight thousand, thirteen".