13972981613 has 2 divisors, whose sum is σ = 13972981614. Its totient is φ = 13972981612.

The previous prime is 13972981609. The next prime is 13972981669. The reversal of 13972981613 is 31618927931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7973239849 + 5999741764 = 89293^2 + 77458^2 .

It is a cyclic number.

It is not a de Polignac number, because 13972981613 - 2² = 13972981609 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13972951613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6986490806 + 6986490807.

It is an arithmetic number, because the mean of its divisors is an integer number (6986490807).

Almost surely, 2^13972981613 is an apocalyptic number.

It is an amenable number.

13972981613 is a deficient number, since it is larger than the sum of its proper divisors (1).

13972981613 is an equidigital number, since it uses as much as digits as its factorization.

13972981613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 50.

The spelling of 13972981613 in words is "thirteen billion, nine hundred seventy-two million, nine hundred eighty-one thousand, six hundred thirteen".