138314989891 has 4 divisors (see below), whose sum is σ = 148954604512. Its totient is φ = 127675375272.

The previous prime is 138314989859. The next prime is 138314989913. The reversal of 138314989891 is 198989413831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138314989891 - 2⁵ = 138314989859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138314989831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5319807291 + ... + 5319807316.

It is an arithmetic number, because the mean of its divisors is an integer number (37238651128).

Almost surely, 2^138314989891 is an apocalyptic number.

138314989891 is a deficient number, since it is larger than the sum of its proper divisors (10639614621).

138314989891 is a wasteful number, since it uses less digits than its factorization.

138314989891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10639614620.

The product of its digits is 13436928, while the sum is 64.

The spelling of 138314989891 in words is "one hundred thirty-eight billion, three hundred fourteen million, nine hundred eighty-nine thousand, eight hundred ninety-one".