13893725981 has 2 divisors, whose sum is σ = 13893725982. Its totient is φ = 13893725980.

The previous prime is 13893725953. The next prime is 13893726031. The reversal of 13893725981 is 18952739831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13031364025 + 862361956 = 114155^2 + 29366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13893725981 is a prime.

It is a super-2 number, since 2×13893725981² (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 (13893725921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6946862990 + 6946862991.

It is an arithmetic number, because the mean of its divisors is an integer number (6946862991).

Almost surely, 2^13893725981 is an apocalyptic number.

It is an amenable number.

13893725981 is a deficient number, since it is larger than the sum of its proper divisors (1).

13893725981 is an equidigital number, since it uses as much as digits as its factorization.

13893725981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 56.

The spelling of 13893725981 in words is "thirteen billion, eight hundred ninety-three million, seven hundred twenty-five thousand, nine hundred eighty-one".