115913391 has 16 divisors (see below), whose sum is σ = 168998400. Its totient is φ = 70085120.

The previous prime is 115913381. The next prime is 115913407. The reversal of 115913391 is 193319511.

It is a cyclic number.

It is not a de Polignac number, because 115913391 - 2⁷ = 115913263 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115913381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10906 + ... + 18728.

It is an arithmetic number, because the mean of its divisors is an integer number (10562400).

Almost surely, 2^115913391 is an apocalyptic number.

115913391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

115913391 is a deficient number, since it is larger than the sum of its proper divisors (53085009).

115913391 is a wasteful number, since it uses less digits than its factorization.

115913391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8286.

The product of its digits is 3645, while the sum is 33.

The square root of 115913391 is about 10766.3081416055. The cubic root of 115913391 is about 487.5784888746.

The spelling of 115913391 in words is "one hundred fifteen million, nine hundred thirteen thousand, three hundred ninety-one".