115661181 has 16 divisors (see below), whose sum is σ = 163653120. Its totient is φ = 72502320.

The previous prime is 115661177. The next prime is 115661191. The reversal of 115661181 is 181166511.

It is not a de Polignac number, because 115661181 - 2² = 115661177 is a prime.

It is a super-2 number, since 2×115661181² = 26755017580629522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115661111) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 10135 + ... + 18276.

It is an arithmetic number, because the mean of its divisors is an integer number (10228320).

Almost surely, 2^115661181 is an apocalyptic number.

It is an amenable number.

115661181 is a deficient number, since it is larger than the sum of its proper divisors (47991939).

115661181 is a wasteful number, since it uses less digits than its factorization.

115661181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28496.

The product of its digits is 1440, while the sum is 30.

The square root of 115661181 is about 10754.5888345394. The cubic root of 115661181 is about 487.2245997418.

The spelling of 115661181 in words is "one hundred fifteen million, six hundred sixty-one thousand, one hundred eighty-one".