115972879691 has 4 divisors (see below), whose sum is σ = 121015178832. Its totient is φ = 110930580552.

The previous prime is 115972879667. The next prime is 115972879697. The reversal of 115972879691 is 196978279511.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115972879691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115972879697) 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, 2521149536 + ... + 2521149581.

It is an arithmetic number, because the mean of its divisors is an integer number (30253794708).

Almost surely, 2^115972879691 is an apocalyptic number.

115972879691 is a deficient number, since it is larger than the sum of its proper divisors (5042299141).

115972879691 is an equidigital number, since it uses as much as digits as its factorization.

115972879691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5042299140.

The product of its digits is 17146080, while the sum is 65.

The spelling of 115972879691 in words is "one hundred fifteen billion, nine hundred seventy-two million, eight hundred seventy-nine thousand, six hundred ninety-one".