181088985 has 64 divisors (see below), whose sum is σ = 365783040. Its totient is φ = 74311680.

The previous prime is 181088977. The next prime is 181088993. The reversal of 181088985 is 589880181.

It is an interprime number because it is at equal distance from previous prime (181088977) and next prime (181088993).

It is not a de Polignac number, because 181088985 - 2³ = 181088977 is a prime.

Together with 184694055 it forms an amicable pair .

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 94921 + ... + 96809.

It is an arithmetic number, because the mean of its divisors is an integer number (5715360).

Almost surely, 2^181088985 is an apocalyptic number.

181088985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181088985 is an abundant number, since it is smaller than the sum of its proper divisors (184694055).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181088985 is a wasteful number, since it uses less digits than its factorization.

181088985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998.

The product of its (nonzero) digits is 184320, while the sum is 48.

The square root of 181088985 is about 13456.9307421863. The cubic root of 181088985 is about 565.7579667049.

The spelling of 181088985 in words is "one hundred eighty-one million, eighty-eight thousand, nine hundred eighty-five".