520129913 has 2 divisors, whose sum is σ = 520129914. Its totient is φ = 520129912.

The previous prime is 520129829. The next prime is 520129927. The reversal of 520129913 is 319921025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328805689 + 191324224 = 18133^2 + 13832^2 .

It is a cyclic number.

It is not a de Polignac number, because 520129913 - 2⁸ = 520129657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 520129913.

It is not a weakly prime, because it can be changed into another prime (520129963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260064956 + 260064957.

It is an arithmetic number, because the mean of its divisors is an integer number (260064957).

Almost surely, 2^520129913 is an apocalyptic number.

It is an amenable number.

520129913 is a deficient number, since it is larger than the sum of its proper divisors (1).

520129913 is an equidigital number, since it uses as much as digits as its factorization.

520129913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 520129913 is about 22806.3568550525. The cubic root of 520129913 is about 804.2121133911.

The spelling of 520129913 in words is "five hundred twenty million, one hundred twenty-nine thousand, nine hundred thirteen".