115231509 has 12 divisors (see below), whose sum is σ = 168790752. Its totient is φ = 75738600.

The previous prime is 115231481. The next prime is 115231511. The reversal of 115231509 is 905132511.

115231509 is a `hidden beast` number, since 1 + 152 + 3 + 1 + 509 = 666.

It is not a de Polignac number, because 115231509 - 2⁵ = 115231477 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115231549) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89527 + ... + 90804.

It is an arithmetic number, because the mean of its divisors is an integer number (14065896).

Almost surely, 2^115231509 is an apocalyptic number.

It is an amenable number.

115231509 is a deficient number, since it is larger than the sum of its proper divisors (53559243).

115231509 is a wasteful number, since it uses less digits than its factorization.

115231509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180408 (or 180405 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 115231509 is about 10734.5940305165. The cubic root of 115231509 is about 486.6205176627.

The spelling of 115231509 in words is "one hundred fifteen million, two hundred thirty-one thousand, five hundred nine".