118138881 has 16 divisors (see below), whose sum is σ = 181021568. Its totient is φ = 67132800.

The previous prime is 118138859. The next prime is 118138897. The reversal of 118138881 is 188831811.

It is not a de Polignac number, because 118138881 - 2⁵ = 118138849 is a prime.

It is a super-2 number, since 2×118138881² = 27913590407864322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (118138081) 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, 11740 + ... + 19341.

It is an arithmetic number, because the mean of its divisors is an integer number (11313848).

Almost surely, 2^118138881 is an apocalyptic number.

It is an amenable number.

118138881 is a deficient number, since it is larger than the sum of its proper divisors (62882687).

118138881 is a wasteful number, since it uses less digits than its factorization.

118138881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31272.

The product of its digits is 12288, while the sum is 39.

The square root of 118138881 is about 10869.1711275515. The cubic root of 118138881 is about 490.6791651073.

The spelling of 118138881 in words is "one hundred eighteen million, one hundred thirty-eight thousand, eight hundred eighty-one".