115981155 has 24 divisors (see below), whose sum is σ = 201305520. Its totient is φ = 61773120.

The previous prime is 115981147. The next prime is 115981181. The reversal of 115981155 is 551189511.

115981155 is a `hidden beast` number, since 1 + 1 + 598 + 11 + 55 = 666.

It is not a de Polignac number, because 115981155 - 2³ = 115981147 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 46900 + ... + 49310.

It is an arithmetic number, because the mean of its divisors is an integer number (8387730).

Almost surely, 2^115981155 is an apocalyptic number.

115981155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

115981155 is a deficient number, since it is larger than the sum of its proper divisors (85324365).

115981155 is a wasteful number, since it uses less digits than its factorization.

115981155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3491 (or 3488 counting only the distinct ones).

The product of its digits is 9000, while the sum is 36.

The square root of 115981155 is about 10769.4547215725. The cubic root of 115981155 is about 487.6734846065.

The spelling of 115981155 in words is "one hundred fifteen million, nine hundred eighty-one thousand, one hundred fifty-five".