115589921 has 2 divisors, whose sum is σ = 115589922. Its totient is φ = 115589920.

The previous prime is 115589899. The next prime is 115589923. The reversal of 115589921 is 129985511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76038400 + 39551521 = 8720^2 + 6289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-115589921 is a prime.

It is a super-2 number, since 2×115589921² = 26722059673572482, which contains 22 as substring.

Together with 115589923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (115589923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57794960 + 57794961.

It is an arithmetic number, because the mean of its divisors is an integer number (57794961).

Almost surely, 2^115589921 is an apocalyptic number.

It is an amenable number.

115589921 is a deficient number, since it is larger than the sum of its proper divisors (1).

115589921 is an equidigital number, since it uses as much as digits as its factorization.

115589921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 41.

The square root of 115589921 is about 10751.2753197004. The cubic root of 115589921 is about 487.1245178834.

The spelling of 115589921 in words is "one hundred fifteen million, five hundred eighty-nine thousand, nine hundred twenty-one".