118108781 has 16 divisors (see below), whose sum is σ = 136581120. Its totient is φ = 100045680.

The previous prime is 118108777. The next prime is 118108799. The reversal of 118108781 is 187801811.

It is not a de Polignac number, because 118108781 - 2² = 118108777 is a prime.

It is a super-2 number, since 2×118108781² = 27899368298611922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118108721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 379616 + ... + 379926.

It is an arithmetic number, because the mean of its divisors is an integer number (8536320).

Almost surely, 2^118108781 is an apocalyptic number.

It is an amenable number.

118108781 is a deficient number, since it is larger than the sum of its proper divisors (18472339).

118108781 is a wasteful number, since it uses less digits than its factorization.

118108781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784.

The product of its (nonzero) digits is 3584, while the sum is 35.

The square root of 118108781 is about 10867.7863891411. The cubic root of 118108781 is about 490.6374890245.

The spelling of 118108781 in words is "one hundred eighteen million, one hundred eight thousand, seven hundred eighty-one".