520318613 has 2 divisors, whose sum is σ = 520318614. Its totient is φ = 520318612.

The previous prime is 520318607. The next prime is 520318639. The reversal of 520318613 is 316813025.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497869969 + 22448644 = 22313^2 + 4738^2 .

It is a cyclic number.

It is not a de Polignac number, because 520318613 - 2⁶ = 520318549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520318693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260159306 + 260159307.

It is an arithmetic number, because the mean of its divisors is an integer number (260159307).

Almost surely, 2^520318613 is an apocalyptic number.

It is an amenable number.

520318613 is a deficient number, since it is larger than the sum of its proper divisors (1).

520318613 is an equidigital number, since it uses as much as digits as its factorization.

520318613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 520318613 is about 22810.4934843593. The cubic root of 520318613 is about 804.3093560695.

The spelling of 520318613 in words is "five hundred twenty million, three hundred eighteen thousand, six hundred thirteen".