117891181 has 16 divisors (see below), whose sum is σ = 128136960. Its totient is φ = 108103680.

The previous prime is 117891173. The next prime is 117891197. The reversal of 117891181 is 181198711.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 117891181 - 2³ = 117891173 is a prime.

It is a super-2 number, since 2×117891181² = 27796661115149522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 117891181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117891161) 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, 85941 + ... + 87301.

It is an arithmetic number, because the mean of its divisors is an integer number (8008560).

Almost surely, 2^117891181 is an apocalyptic number.

It is an amenable number.

117891181 is a deficient number, since it is larger than the sum of its proper divisors (10245779).

117891181 is a wasteful number, since it uses less digits than its factorization.

117891181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524.

The product of its digits is 4032, while the sum is 37.

The square root of 117891181 is about 10857.7705354276. The cubic root of 117891181 is about 490.3359919657.

The spelling of 117891181 in words is "one hundred seventeen million, eight hundred ninety-one thousand, one hundred eighty-one".