115978181 has 16 divisors (see below), whose sum is σ = 130014720. Its totient is φ = 102545520.

The previous prime is 115978171. The next prime is 115978183. The reversal of 115978181 is 181879511.

It is not a de Polignac number, because 115978181 - 2¹⁰ = 115977157 is a prime.

It is a super-2 number, since 2×115978181² = 26901876936137522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115978183) 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, 169466 + ... + 170148.

It is an arithmetic number, because the mean of its divisors is an integer number (8125920).

Almost surely, 2^115978181 is an apocalyptic number.

115978181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

115978181 is a deficient number, since it is larger than the sum of its proper divisors (14036539).

115978181 is a wasteful number, since it uses less digits than its factorization.

115978181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1096.

The product of its digits is 20160, while the sum is 41.

The square root of 115978181 is about 10769.3166449873. The cubic root of 115978181 is about 487.6693162473.

The spelling of 115978181 in words is "one hundred fifteen million, nine hundred seventy-eight thousand, one hundred eighty-one".