505631657 has 2 divisors, whose sum is σ = 505631658. Its totient is φ = 505631656.

The previous prime is 505631627. The next prime is 505631671. The reversal of 505631657 is 756136505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317694976 + 187936681 = 17824^2 + 13709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505631657 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505631657.

It is not a weakly prime, because it can be changed into another prime (505631627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252815828 + 252815829.

It is an arithmetic number, because the mean of its divisors is an integer number (252815829).

Almost surely, 2^505631657 is an apocalyptic number.

It is an amenable number.

505631657 is a deficient number, since it is larger than the sum of its proper divisors (1).

505631657 is an equidigital number, since it uses as much as digits as its factorization.

505631657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94500, while the sum is 38.

The square root of 505631657 is about 22486.2548460165. The cubic root of 505631657 is about 796.6693070373.

The spelling of 505631657 in words is "five hundred five million, six hundred thirty-one thousand, six hundred fifty-seven".