108911891 has 16 divisors (see below), whose sum is σ = 121325568. Its totient is φ = 96940800.

The previous prime is 108911879. The next prime is 108911899. The reversal of 108911891 is 198119801.

It is a de Polignac number, because none of the positive numbers 2^k-108911891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108911899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109406 + ... + 110396.

It is an arithmetic number, because the mean of its divisors is an integer number (7582848).

Almost surely, 2^108911891 is an apocalyptic number.

108911891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

108911891 is a deficient number, since it is larger than the sum of its proper divisors (12413677).

108911891 is a wasteful number, since it uses less digits than its factorization.

108911891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202.

The product of its (nonzero) digits is 5184, while the sum is 38.

The square root of 108911891 is about 10436.0860000289. The cubic root of 108911891 is about 477.5568726974.

The spelling of 108911891 in words is "one hundred eight million, nine hundred eleven thousand, eight hundred ninety-one".