109111110191 has 4 divisors (see below), whose sum is σ = 109112964984. Its totient is φ = 109109255400.

The previous prime is 109111110179. The next prime is 109111110203. The reversal of 109111110191 is 191011111901.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (109111110179) and next prime (109111110203).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109111110191 is a prime.

It is a super-2 number, since 2×109111110191² (a number of 23 digits) 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 109111110191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109111112191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 836165 + ... + 957806.

It is an arithmetic number, because the mean of its divisors is an integer number (27278241246).

Almost surely, 2^109111110191 is an apocalyptic number.

109111110191 is a deficient number, since it is larger than the sum of its proper divisors (1854793).

109111110191 is an equidigital number, since it uses as much as digits as its factorization.

109111110191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854792.

The product of its (nonzero) digits is 81, while the sum is 26.

The spelling of 109111110191 in words is "one hundred nine billion, one hundred eleven million, one hundred ten thousand, one hundred ninety-one".