656543317 has 2 divisors, whose sum is σ = 656543318. Its totient is φ = 656543316.

The previous prime is 656543249. The next prime is 656543353. The reversal of 656543317 is 713345656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 602506116 + 54037201 = 24546^2 + 7351^2 .

It is a cyclic number.

It is not a de Polignac number, because 656543317 - 2¹⁵ = 656510549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656543317.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656543357) 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, 328271658 + 328271659.

It is an arithmetic number, because the mean of its divisors is an integer number (328271659).

Almost surely, 2^656543317 is an apocalyptic number.

It is an amenable number.

656543317 is a deficient number, since it is larger than the sum of its proper divisors (1).

656543317 is an equidigital number, since it uses as much as digits as its factorization.

656543317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 40.

The square root of 656543317 is about 25623.1012369697. The cubic root of 656543317 is about 869.1361121222.

The spelling of 656543317 in words is "six hundred fifty-six million, five hundred forty-three thousand, three hundred seventeen".