656897 has 6 divisors (see below), whose sum is σ = 698118. Its totient is φ = 617984.

The previous prime is 656891. The next prime is 656917. The reversal of 656897 is 798656.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 410881 + 246016 = 641^2 + 496^2 .

It is not a de Polignac number, because 656897 - 2⁶ = 656833 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 848 + ... + 1425.

It is an arithmetic number, because the mean of its divisors is an integer number (116353).

2⁶⁵⁶⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

656897 is a deficient number, since it is larger than the sum of its proper divisors (41221).

656897 is a wasteful number, since it uses less digits than its factorization.

656897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307 (or 2290 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 656897 is about 810.4918259921. The cubic root of 656897 is about 86.9292153355.

The spelling of 656897 in words is "six hundred fifty-six thousand, eight hundred ninety-seven".