656964109 has 2 divisors, whose sum is σ = 656964110. Its totient is φ = 656964108.

The previous prime is 656964101. The next prime is 656964149. The reversal of 656964109 is 901469656.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 576144009 + 80820100 = 24003^2 + 8990^2 .

It is a cyclic number.

It is not a de Polignac number, because 656964109 - 2³ = 656964101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (656964101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328482054 + 328482055.

It is an arithmetic number, because the mean of its divisors is an integer number (328482055).

Almost surely, 2^656964109 is an apocalyptic number.

It is an amenable number.

656964109 is a deficient number, since it is larger than the sum of its proper divisors (1).

656964109 is an equidigital number, since it uses as much as digits as its factorization.

656964109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The square root of 656964109 is about 25631.3111057550. The cubic root of 656964109 is about 869.3217548196.

The spelling of 656964109 in words is "six hundred fifty-six million, nine hundred sixty-four thousand, one hundred nine".