520613657 has 2 divisors, whose sum is σ = 520613658. Its totient is φ = 520613656.

The previous prime is 520613617. The next prime is 520613693. The reversal of 520613657 is 756316025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506295001 + 14318656 = 22501^2 + 3784^2 .

It is a cyclic number.

It is not a de Polignac number, because 520613657 - 2²⁴ = 503836441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520613617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260306828 + 260306829.

It is an arithmetic number, because the mean of its divisors is an integer number (260306829).

Almost surely, 2^520613657 is an apocalyptic number.

It is an amenable number.

520613657 is a deficient number, since it is larger than the sum of its proper divisors (1).

520613657 is an equidigital number, since it uses as much as digits as its factorization.

520613657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 520613657 is about 22816.9598544591. The cubic root of 520613657 is about 804.4613538413.

The spelling of 520613657 in words is "five hundred twenty million, six hundred thirteen thousand, six hundred fifty-seven".