656031657 has 4 divisors (see below), whose sum is σ = 874708880. Its totient is φ = 437354436.

The previous prime is 656031619. The next prime is 656031689. The reversal of 656031657 is 756130656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 656031657 - 2⁸ = 656031401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656031697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109338607 + ... + 109338612.

It is an arithmetic number, because the mean of its divisors is an integer number (218677220).

Almost surely, 2^656031657 is an apocalyptic number.

It is an amenable number.

656031657 is a deficient number, since it is larger than the sum of its proper divisors (218677223).

656031657 is a wasteful number, since it uses less digits than its factorization.

656031657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218677222.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 656031657 is about 25613.1149413733. The cubic root of 656031657 is about 868.9102738852.

The spelling of 656031657 in words is "six hundred fifty-six million, thirty-one thousand, six hundred fifty-seven".