8191111918 has 16 divisors (see below), whose sum is σ = 13536350640. Its totient is φ = 3686368000.

The previous prime is 8191111889. The next prime is 8191111933.

8191111918 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1840963 + ... + 1845406.

It is an arithmetic number, because the mean of its divisors is an integer number (846021915).

Almost surely, 2^8191111918 is an apocalyptic number.

8191111918 is a deficient number, since it is larger than the sum of its proper divisors (5345238722).

8191111918 is a wasteful number, since it uses less digits than its factorization.

8191111918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3686483.

The product of its digits is 5184, while the sum is 40.

The square root of 8191111918 is about 90504.7618526230. The cubic root of 8191111918 is about 2015.8008312874.

The spelling of 8191111918 in words is "eight billion, one hundred ninety-one million, one hundred eleven thousand, nine hundred eighteen".