656880031 has 4 divisors (see below), whose sum is σ = 657842472. Its totient is φ = 655917592.

The previous prime is 656879969. The next prime is 656880041. The reversal of 656880031 is 130088656.

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

It is a cyclic number.

It is not a de Polignac number, because 656880031 - 2⁹ = 656879519 is a prime.

It is a super-2 number, since 2×656880031² = 862982750253121922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656880041) 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, 480196 + ... + 481561.

It is an arithmetic number, because the mean of its divisors is an integer number (164460618).

Almost surely, 2^656880031 is an apocalyptic number.

656880031 is a deficient number, since it is larger than the sum of its proper divisors (962441).

656880031 is an equidigital number, since it uses as much as digits as its factorization.

656880031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962440.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 656880031 is about 25629.6709108798. The cubic root of 656880031 is about 869.2846680890.

The spelling of 656880031 in words is "six hundred fifty-six million, eight hundred eighty thousand, thirty-one".