656304137 has 6 divisors (see below), whose sum is σ = 692664858. Its totient is φ = 621761472.

The previous prime is 656304119. The next prime is 656304167. The reversal of 656304137 is 731403656.

It can be written as a sum of positive squares in only one way, i.e., 445589881 + 210714256 = 21109^2 + 14516^2 .

It is not a de Polignac number, because 656304137 - 2¹⁸ = 656041993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656304097 and 656304106.

It is not an unprimeable number, because it can be changed into a prime (656304107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 908648 + ... + 909369.

It is an arithmetic number, because the mean of its divisors is an integer number (115444143).

Almost surely, 2^656304137 is an apocalyptic number.

It is an amenable number.

656304137 is a deficient number, since it is larger than the sum of its proper divisors (36360721).

656304137 is a wasteful number, since it uses less digits than its factorization.

656304137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818055 (or 1818036 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 656304137 is about 25618.4335391530. The cubic root of 656304137 is about 869.0305566477.

The spelling of 656304137 in words is "six hundred fifty-six million, three hundred four thousand, one hundred thirty-seven".