115439221 has 2 divisors, whose sum is σ = 115439222. Its totient is φ = 115439220.

The previous prime is 115439213. The next prime is 115439237. The reversal of 115439221 is 122934511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71216721 + 44222500 = 8439^2 + 6650^2 .

It is a cyclic number.

It is not a de Polignac number, because 115439221 - 2³ = 115439213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 115439221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115439201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57719610 + 57719611.

It is an arithmetic number, because the mean of its divisors is an integer number (57719611).

Almost surely, 2^115439221 is an apocalyptic number.

It is an amenable number.

115439221 is a deficient number, since it is larger than the sum of its proper divisors (1).

115439221 is an equidigital number, since it uses as much as digits as its factorization.

115439221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 28.

The square root of 115439221 is about 10744.2645630122. The cubic root of 115439221 is about 486.9127301258.

The spelling of 115439221 in words is "one hundred fifteen million, four hundred thirty-nine thousand, two hundred twenty-one".