656687 has 2 divisors, whose sum is σ = 656688. Its totient is φ = 656686.

The previous prime is 656683. The next prime is 656701. The reversal of 656687 is 786656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656687 - 2² = 656683 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656687.

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 656687.

It is not a weakly prime, because it can be changed into another prime (656681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328343 + 328344.

It is an arithmetic number, because the mean of its divisors is an integer number (328344).

2⁶⁵⁶⁶⁸⁷ is an apocalyptic number.

656687 is a deficient number, since it is larger than the sum of its proper divisors (1).

656687 is an equidigital number, since it uses as much as digits as its factorization.

656687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 38.

The square root of 656687 is about 810.3622646693. The cubic root of 656687 is about 86.9199510313.

The spelling of 656687 in words is "six hundred fifty-six thousand, six hundred eighty-seven".