13938833981 has 2 divisors, whose sum is σ = 13938833982. Its totient is φ = 13938833980.

The previous prime is 13938833977. The next prime is 13938834037. The reversal of 13938833981 is 18933883931.

It is a happy number.

It is an a-pointer prime, because the next prime (13938834037) can be obtained adding 13938833981 to its sum of digits (56).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12263569081 + 1675264900 = 110741^2 + 40930^2 .

It is an emirp because it is prime and its reverse (18933883931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13938833981 - 2² = 13938833977 is a prime.

It is a super-2 number, since 2×13938833981² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13938833921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6969416990 + 6969416991.

It is an arithmetic number, because the mean of its divisors is an integer number (6969416991).

Almost surely, 2^13938833981 is an apocalyptic number.

It is an amenable number.

13938833981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13938833981 is an equidigital number, since it uses as much as digits as its factorization.

13938833981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 56.

The spelling of 13938833981 in words is "thirteen billion, nine hundred thirty-eight million, eight hundred thirty-three thousand, nine hundred eighty-one".