115881591 has 8 divisors (see below), whose sum is σ = 176581504. Its totient is φ = 66218040.

The previous prime is 115881583. The next prime is 115881599. The reversal of 115881591 is 195188511.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (115881583) and next prime (115881599).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 115881591 - 2³ = 115881583 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 (115881599) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2759065 + ... + 2759106.

It is an arithmetic number, because the mean of its divisors is an integer number (22072688).

Almost surely, 2^115881591 is an apocalyptic number.

115881591 is a deficient number, since it is larger than the sum of its proper divisors (60699913).

115881591 is an equidigital number, since it uses as much as digits as its factorization.

115881591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5518181.

The product of its digits is 14400, while the sum is 39.

The square root of 115881591 is about 10764.8312109387. The cubic root of 115881591 is about 487.5338969198.

The spelling of 115881591 in words is "one hundred fifteen million, eight hundred eighty-one thousand, five hundred ninety-one".