81118163 has 8 divisors (see below), whose sum is σ = 97585920. Its totient is φ = 65870280.

The previous prime is 81118157. The next prime is 81118181. The reversal of 81118163 is 36181118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81118163 - 2²² = 76923859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81118123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 304823 + ... + 305088.

It is an arithmetic number, because the mean of its divisors is an integer number (12198240).

Almost surely, 2^81118163 is an apocalyptic number.

81118163 is a deficient number, since it is larger than the sum of its proper divisors (16467757).

81118163 is a wasteful number, since it uses less digits than its factorization.

81118163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 609937.

The product of its digits is 1152, while the sum is 29.

The square root of 81118163 is about 9006.5622187381. The cubic root of 81118163 is about 432.8851645899.

The spelling of 81118163 in words is "eighty-one million, one hundred eighteen thousand, one hundred sixty-three".