108911991099 has 8 divisors (see below), whose sum is σ = 149140744720. Its totient is φ = 70645615776.

The previous prime is 108911991077. The next prime is 108911991101. The reversal of 108911991099 is 990199119801.

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

It is not a de Polignac number, because 108911991099 - 2⁹ = 108911990587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108911991499) 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, 490594444 + ... + 490594665.

It is an arithmetic number, because the mean of its divisors is an integer number (18642593090).

Almost surely, 2^108911991099 is an apocalyptic number.

108911991099 is a deficient number, since it is larger than the sum of its proper divisors (40228753621).

108911991099 is an equidigital number, since it uses as much as digits as its factorization.

108911991099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981189149.

The product of its (nonzero) digits is 472392, while the sum is 57.

The spelling of 108911991099 in words is "one hundred eight billion, nine hundred eleven million, nine hundred ninety-one thousand, ninety-nine".