13688881 has 2 divisors, whose sum is σ = 13688882. Its totient is φ = 13688880.

The previous prime is 13688879. The next prime is 13688897. The reversal of 13688881 is 18888631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11390625 + 2298256 = 3375^2 + 1516^2 .

It is an emirp because it is prime and its reverse (18888631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13688881 - 2¹ = 13688879 is a prime.

It is a super-2 number, since 2×13688881² = 374770926064322, which contains 22 as substring.

Together with 13688879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13688981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6844440 + 6844441.

It is an arithmetic number, because the mean of its divisors is an integer number (6844441).

Almost surely, 2^13688881 is an apocalyptic number.

It is an amenable number.

13688881 is a deficient number, since it is larger than the sum of its proper divisors (1).

13688881 is an equidigital number, since it uses as much as digits as its factorization.

13688881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73728, while the sum is 43.

The square root of 13688881 is about 3699.8487806936. The cubic root of 13688881 is about 239.2154998010.

The spelling of 13688881 in words is "thirteen million, six hundred eighty-eight thousand, eight hundred eighty-one".