520016309 has 2 divisors, whose sum is σ = 520016310. Its totient is φ = 520016308.

The previous prime is 520016297. The next prime is 520016311. The reversal of 520016309 is 903610025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393903409 + 126112900 = 19847^2 + 11230^2 .

It is a cyclic number.

It is not a de Polignac number, because 520016309 - 2²⁰ = 518967733 is a prime.

Together with 520016311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520013309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260008154 + 260008155.

It is an arithmetic number, because the mean of its divisors is an integer number (260008155).

Almost surely, 2^520016309 is an apocalyptic number.

It is an amenable number.

520016309 is a deficient number, since it is larger than the sum of its proper divisors (1).

520016309 is an equidigital number, since it uses as much as digits as its factorization.

520016309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 520016309 is about 22803.8660976598. The cubic root of 520016309 is about 804.1535585551.

The spelling of 520016309 in words is "five hundred twenty million, sixteen thousand, three hundred nine".