520013257 has 2 divisors, whose sum is σ = 520013258. Its totient is φ = 520013256.

The previous prime is 520013213. The next prime is 520013267. The reversal of 520013257 is 752310025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 321879481 + 198133776 = 17941^2 + 14076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520013257 is a prime.

It is not a weakly prime, because it can be changed into another prime (520013267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260006628 + 260006629.

It is an arithmetic number, because the mean of its divisors is an integer number (260006629).

Almost surely, 2^520013257 is an apocalyptic number.

It is an amenable number.

520013257 is a deficient number, since it is larger than the sum of its proper divisors (1).

520013257 is an equidigital number, since it uses as much as digits as its factorization.

520013257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 520013257 is about 22803.7991790842. The cubic root of 520013257 is about 804.1519853471.

The spelling of 520013257 in words is "five hundred twenty million, thirteen thousand, two hundred fifty-seven".