656560931 has 8 divisors (see below), whose sum is σ = 708704640. Its totient is φ = 604651392.

The previous prime is 656560913. The next prime is 656560973. The reversal of 656560931 is 139065656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656560931 is a prime.

It is a super-2 number, since 2×656560931² = 862144512231173522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656560981) 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 in 7 ways as a sum of consecutive naturals, for example, 52691 + ... + 63948.

It is an arithmetic number, because the mean of its divisors is an integer number (88588080).

Almost surely, 2^656560931 is an apocalyptic number.

656560931 is a deficient number, since it is larger than the sum of its proper divisors (52143709).

656560931 is a wasteful number, since it uses less digits than its factorization.

656560931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117085.

The product of its (nonzero) digits is 145800, while the sum is 41.

The square root of 656560931 is about 25623.4449479378. Note that the first 3 decimals coincide. The cubic root of 656560931 is about 869.1438845601.

The spelling of 656560931 in words is "six hundred fifty-six million, five hundred sixty thousand, nine hundred thirty-one".