13318343981 has 2 divisors, whose sum is σ = 13318343982. Its totient is φ = 13318343980.

The previous prime is 13318343897. The next prime is 13318344001. The reversal of 13318343981 is 18934381331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13309313956 + 9030025 = 115366^2 + 3005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13318343981 is a prime.

It is a super-2 number, since 2×13318343981² (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 (13318343081) 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, 6659171990 + 6659171991.

It is an arithmetic number, because the mean of its divisors is an integer number (6659171991).

Almost surely, 2^13318343981 is an apocalyptic number.

It is an amenable number.

13318343981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13318343981 is an equidigital number, since it uses as much as digits as its factorization.

13318343981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The spelling of 13318343981 in words is "thirteen billion, three hundred eighteen million, three hundred forty-three thousand, nine hundred eighty-one".