13661689 has 2 divisors, whose sum is σ = 13661690. Its totient is φ = 13661688.

The previous prime is 13661671. The next prime is 13661759. The reversal of 13661689 is 98616631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6943225 + 6718464 = 2635^2 + 2592^2 .

It is a cyclic number.

It is not a de Polignac number, because 13661689 - 2⁷ = 13661561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13601689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6830844 + 6830845.

It is an arithmetic number, because the mean of its divisors is an integer number (6830845).

Almost surely, 2^13661689 is an apocalyptic number.

It is an amenable number.

13661689 is a deficient number, since it is larger than the sum of its proper divisors (1).

13661689 is an equidigital number, since it uses as much as digits as its factorization.

13661689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 40.

The square root of 13661689 is about 3696.1722091916. The cubic root of 13661689 is about 239.0569998792.

The spelling of 13661689 in words is "thirteen million, six hundred sixty-one thousand, six hundred eighty-nine".