656791 has 2 divisors, whose sum is σ = 656792. Its totient is φ = 656790.

The previous prime is 656783. The next prime is 656809. The reversal of 656791 is 197656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656791 - 2³ = 656783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328395 + 328396.

It is an arithmetic number, because the mean of its divisors is an integer number (328396).

2⁶⁵⁶⁷⁹¹ is an apocalyptic number.

656791 is a deficient number, since it is larger than the sum of its proper divisors (1).

656791 is an equidigital number, since it uses as much as digits as its factorization.

656791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 34.

The square root of 656791 is about 810.4264309609. The cubic root of 656791 is about 86.9245393145.

The spelling of 656791 in words is "six hundred fifty-six thousand, seven hundred ninety-one".