656949317 has 4 divisors (see below), whose sum is σ = 664330860. Its totient is φ = 649567776.

The previous prime is 656949289. The next prime is 656949329. The reversal of 656949317 is 713949656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 125462401 + 531486916 = 11201^2 + 23054^2 .

It is a cyclic number.

It is not a de Polignac number, because 656949317 - 2¹⁰ = 656948293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656949217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3690638 + ... + 3690815.

It is an arithmetic number, because the mean of its divisors is an integer number (166082715).

Almost surely, 2^656949317 is an apocalyptic number.

It is an amenable number.

656949317 is a deficient number, since it is larger than the sum of its proper divisors (7381543).

656949317 is an equidigital number, since it uses as much as digits as its factorization.

656949317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7381542.

The product of its digits is 1224720, while the sum is 50.

The square root of 656949317 is about 25631.0225508074. The cubic root of 656949317 is about 869.3152303110.

The spelling of 656949317 in words is "six hundred fifty-six million, nine hundred forty-nine thousand, three hundred seventeen".