81111189 has 8 divisors (see below), whose sum is σ = 108331200. Its totient is φ = 53982656.

The previous prime is 81111187. The next prime is 81111193. The reversal of 81111189 is 98111118.

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

It is a cyclic number.

It is not a de Polignac number, because 81111189 - 2¹ = 81111187 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81111187) 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 7 ways as a sum of consecutive naturals, for example, 20772 + ... + 24365.

It is an arithmetic number, because the mean of its divisors is an integer number (13541400).

Almost surely, 2^81111189 is an apocalyptic number.

It is an amenable number.

81111189 is a deficient number, since it is larger than the sum of its proper divisors (27220011).

81111189 is a wasteful number, since it uses less digits than its factorization.

81111189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45739.

The product of its digits is 576, while the sum is 30.

The square root of 81111189 is about 9006.1750482655. The cubic root of 81111189 is about 432.8727587055.

The spelling of 81111189 in words is "eighty-one million, one hundred eleven thousand, one hundred eighty-nine".