115581979 has 4 divisors (see below), whose sum is σ = 118269976. Its totient is φ = 112893984.

The previous prime is 115581953. The next prime is 115582009. The reversal of 115581979 is 979185511.

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 115581979 - 2⁹ = 115581467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115581779) 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, 1343934 + ... + 1344019.

It is an arithmetic number, because the mean of its divisors is an integer number (29567494).

Almost surely, 2^115581979 is an apocalyptic number.

115581979 is a deficient number, since it is larger than the sum of its proper divisors (2687997).

115581979 is an equidigital number, since it uses as much as digits as its factorization.

115581979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687996.

The product of its digits is 113400, while the sum is 46.

The square root of 115581979 is about 10750.9059618248. The cubic root of 115581979 is about 487.1133611104.

The spelling of 115581979 in words is "one hundred fifteen million, five hundred eighty-one thousand, nine hundred seventy-nine".