13868320981 has 2 divisors, whose sum is σ = 13868320982. Its totient is φ = 13868320980.

The previous prime is 13868320967. The next prime is 13868320987. The reversal of 13868320981 is 18902386831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8886078756 + 4982242225 = 94266^2 + 70585^2 .

It is an emirp because it is prime and its reverse (18902386831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13868320981 - 2⁷ = 13868320853 is a prime.

It is a super-2 number, since 2×13868320981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13868320987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6934160490 + 6934160491.

It is an arithmetic number, because the mean of its divisors is an integer number (6934160491).

Almost surely, 2^13868320981 is an apocalyptic number.

It is an amenable number.

13868320981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13868320981 is an equidigital number, since it uses as much as digits as its factorization.

13868320981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 13868320981 in words is "thirteen billion, eight hundred sixty-eight million, three hundred twenty thousand, nine hundred eighty-one".