13656689 has 2 divisors, whose sum is σ = 13656690. Its totient is φ = 13656688.

The previous prime is 13656683. The next prime is 13656697. The reversal of 13656689 is 98665631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11122225 + 2534464 = 3335^2 + 1592^2 .

It is a cyclic number.

It is not a de Polignac number, because 13656689 - 2⁴ = 13656673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13656683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6828344 + 6828345.

It is an arithmetic number, because the mean of its divisors is an integer number (6828345).

Almost surely, 2^13656689 is an apocalyptic number.

It is an amenable number.

13656689 is a deficient number, since it is larger than the sum of its proper divisors (1).

13656689 is an equidigital number, since it uses as much as digits as its factorization.

13656689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 44.

The square root of 13656689 is about 3695.4957718823. The cubic root of 13656689 is about 239.0278324058.

The spelling of 13656689 in words is "thirteen million, six hundred fifty-six thousand, six hundred eighty-nine".