118778881 has 16 divisors (see below), whose sum is σ = 136733184. Its totient is φ = 102207744.

The previous prime is 118778797. The next prime is 118778941. The reversal of 118778881 is 188877811.

It is a cyclic number.

It is not a de Polignac number, because 118778881 - 2⁷ = 118778753 is a prime.

It is a super-2 number, since 2×118778881² = 28216845143224322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118772881) 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, 21136 + ... + 26158.

It is an arithmetic number, because the mean of its divisors is an integer number (8545824).

Almost surely, 2^118778881 is an apocalyptic number.

It is an amenable number.

118778881 is a deficient number, since it is larger than the sum of its proper divisors (17954303).

118778881 is a wasteful number, since it uses less digits than its factorization.

118778881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5160.

The product of its digits is 200704, while the sum is 49.

The square root of 118778881 is about 10898.5724294515. The cubic root of 118778881 is about 491.5636305904.

The spelling of 118778881 in words is "one hundred eighteen million, seven hundred seventy-eight thousand, eight hundred eighty-one".