520655657 has 2 divisors, whose sum is σ = 520655658. Its totient is φ = 520655656.

The previous prime is 520655609. The next prime is 520655693. The reversal of 520655657 is 756556025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 456719641 + 63936016 = 21371^2 + 7996^2 .

It is a cyclic number.

It is not a de Polignac number, because 520655657 - 2¹² = 520651561 is a prime.

It is a super-2 number, since 2×520655657² = 542164626332203298, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (520655257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260327828 + 260327829.

It is an arithmetic number, because the mean of its divisors is an integer number (260327829).

Almost surely, 2^520655657 is an apocalyptic number.

It is an amenable number.

520655657 is a deficient number, since it is larger than the sum of its proper divisors (1).

520655657 is an equidigital number, since it uses as much as digits as its factorization.

520655657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 315000, while the sum is 41.

The square root of 520655657 is about 22817.8802039103. The cubic root of 520655657 is about 804.4829863051.

The spelling of 520655657 in words is "five hundred twenty million, six hundred fifty-five thousand, six hundred fifty-seven".