13868681 has 2 divisors, whose sum is σ = 13868682. Its totient is φ = 13868680.

The previous prime is 13868671. The next prime is 13868683. The reversal of 13868681 is 18686831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13808656 + 60025 = 3716^2 + 245^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13868681 is a prime.

It is a super-2 number, since 2×13868681² = 384680625359522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 13868683, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13868683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6934340 + 6934341.

It is an arithmetic number, because the mean of its divisors is an integer number (6934341).

Almost surely, 2^13868681 is an apocalyptic number.

It is an amenable number.

13868681 is a deficient number, since it is larger than the sum of its proper divisors (1).

13868681 is an equidigital number, since it uses as much as digits as its factorization.

13868681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 41.

The square root of 13868681 is about 3724.0678028199. The cubic root of 13868681 is about 240.2582925228.

The spelling of 13868681 in words is "thirteen million, eight hundred sixty-eight thousand, six hundred eighty-one".