13688813 has 2 divisors, whose sum is σ = 13688814. Its totient is φ = 13688812.

The previous prime is 13688809. The next prime is 13688819. The reversal of 13688813 is 31888631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11847364 + 1841449 = 3442^2 + 1357^2 .

It is a cyclic number.

It is not a de Polignac number, because 13688813 - 2² = 13688809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13688819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6844406 + 6844407.

It is an arithmetic number, because the mean of its divisors is an integer number (6844407).

Almost surely, 2^13688813 is an apocalyptic number.

It is an amenable number.

13688813 is a deficient number, since it is larger than the sum of its proper divisors (1).

13688813 is an equidigital number, since it uses as much as digits as its factorization.

13688813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 13688813 is about 3699.8395911174. The cubic root of 13688813 is about 239.2151036965.

The spelling of 13688813 in words is "thirteen million, six hundred eighty-eight thousand, eight hundred thirteen".