13656691 has 8 divisors (see below), whose sum is σ = 13860864. Its totient is φ = 13454280.

The previous prime is 13656689. The next prime is 13656697. The reversal of 13656691 is 19665631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13656691 - 2¹ = 13656689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13656691.

It is not an unprimeable number, because it can be changed into a prime (13656697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23976 + ... + 24538.

It is an arithmetic number, because the mean of its divisors is an integer number (1732608).

Almost surely, 2^13656691 is an apocalyptic number.

13656691 is a deficient number, since it is larger than the sum of its proper divisors (204173).

13656691 is a wasteful number, since it uses less digits than its factorization.

13656691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its digits is 29160, while the sum is 37.

The square root of 13656691 is about 3695.4960424820. The cubic root of 13656691 is about 239.0278440742.

The spelling of 13656691 in words is "thirteen million, six hundred fifty-six thousand, six hundred ninety-one".