656932491 has 16 divisors (see below), whose sum is σ = 989731200. Its totient is φ = 430530984.

The previous prime is 656932483. The next prime is 656932499. The reversal of 656932491 is 194239656.

It is an interprime number because it is at equal distance from previous prime (656932483) and next prime (656932499).

It is not a de Polignac number, because 656932491 - 2³ = 656932483 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656932499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204601 + ... + 207786.

It is an arithmetic number, because the mean of its divisors is an integer number (61858200).

Almost surely, 2^656932491 is an apocalyptic number.

656932491 is a deficient number, since it is larger than the sum of its proper divisors (332798709).

656932491 is a wasteful number, since it uses less digits than its factorization.

656932491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412455 (or 412449 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 656932491 is about 25630.6943136545. The cubic root of 656932491 is about 869.3078085193.

It can be divided in two parts, 6569 and 32491, that added together give a triangular number (39060 = T₂₇₉).

The spelling of 656932491 in words is "six hundred fifty-six million, nine hundred thirty-two thousand, four hundred ninety-one".