115659221 has 4 divisors (see below), whose sum is σ = 119647500. Its totient is φ = 111670944.

The previous prime is 115659217. The next prime is 115659223. The reversal of 115659221 is 122956511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122956511 = 3491 ⋅35221.

It can be written as a sum of positive squares in 2 ways, for example, as 57304900 + 58354321 = 7570^2 + 7639^2 .

It is a cyclic number.

It is not a de Polignac number, because 115659221 - 2² = 115659217 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 (115659223) 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, 1994096 + ... + 1994153.

It is an arithmetic number, because the mean of its divisors is an integer number (29911875).

Almost surely, 2^115659221 is an apocalyptic number.

It is an amenable number.

115659221 is a deficient number, since it is larger than the sum of its proper divisors (3988279).

115659221 is an equidigital number, since it uses as much as digits as its factorization.

115659221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988278.

The product of its digits is 5400, while the sum is 32.

The square root of 115659221 is about 10754.4977102606. The cubic root of 115659221 is about 487.2218475490.

The spelling of 115659221 in words is "one hundred fifteen million, six hundred fifty-nine thousand, two hundred twenty-one".