115979221 has 4 divisors (see below), whose sum is σ = 118446912. Its totient is φ = 113511532.

The previous prime is 115979167. The next prime is 115979231. The reversal of 115979221 is 122979511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122979511 = 31 ⋅3967081.

It is a cyclic number.

It is not a de Polignac number, because 115979221 - 2⁷ = 115979093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115979231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1233775 + ... + 1233868.

It is an arithmetic number, because the mean of its divisors is an integer number (29611728).

Almost surely, 2^115979221 is an apocalyptic number.

It is an amenable number.

115979221 is a deficient number, since it is larger than the sum of its proper divisors (2467691).

115979221 is an equidigital number, since it uses as much as digits as its factorization.

115979221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2467690.

The product of its digits is 11340, while the sum is 37.

The square root of 115979221 is about 10769.3649302083. The cubic root of 115979221 is about 487.6707739197.

The spelling of 115979221 in words is "one hundred fifteen million, nine hundred seventy-nine thousand, two hundred twenty-one".