81118893 has 8 divisors (see below), whose sum is σ = 108209056. Its totient is φ = 54054000.

The previous prime is 81118879. The next prime is 81118949. The reversal of 81118893 is 39881118.

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

It is not a de Polignac number, because 81118893 - 2⁸ = 81118637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81118823) 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, 3243 + ... + 13143.

It is an arithmetic number, because the mean of its divisors is an integer number (13526132).

Almost surely, 2^81118893 is an apocalyptic number.

It is an amenable number.

81118893 is a deficient number, since it is larger than the sum of its proper divisors (27090163).

81118893 is a wasteful number, since it uses less digits than its factorization.

81118893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12635.

The product of its digits is 13824, while the sum is 39.

The square root of 81118893 is about 9006.6027446535. The cubic root of 81118893 is about 432.8864631286.

The spelling of 81118893 in words is "eighty-one million, one hundred eighteen thousand, eight hundred ninety-three".