656031 has 4 divisors (see below), whose sum is σ = 874712. Its totient is φ = 437352.

The previous prime is 656023. The next prime is 656039. The reversal of 656031 is 130656.

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

It is an interprime number because it is at equal distance from previous prime (656023) and next prime (656039).

It is not a de Polignac number, because 656031 - 2³ = 656023 is a prime.

It is a super-3 number, since 3×656031³ = 847021317417833373, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 655989 and 656007.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 656031.

It is not an unprimeable number, because it can be changed into a prime (656039) 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, 109336 + ... + 109341.

It is an arithmetic number, because the mean of its divisors is an integer number (218678).

2⁶⁵⁶⁰³¹ is an apocalyptic number.

656031 is a deficient number, since it is larger than the sum of its proper divisors (218681).

656031 is a wasteful number, since it uses less digits than its factorization.

656031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218680.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 656031 is about 809.9574062875. The cubic root of 656031 is about 86.8909983821.

Adding to 656031 its reverse (130656), we get a palindrome (786687).

The spelling of 656031 in words is "six hundred fifty-six thousand, thirty-one".