109010991 has 12 divisors (see below), whose sum is σ = 149427096. Its totient is φ = 70638480.

The previous prime is 109010981. The next prime is 109011043. The reversal of 109010991 is 199010901.

It is not a de Polignac number, because 109010991 - 2⁶ = 109010927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109010921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 109506 + ... + 110496.

It is an arithmetic number, because the mean of its divisors is an integer number (12452258).

Almost surely, 2^109010991 is an apocalyptic number.

109010991 is a deficient number, since it is larger than the sum of its proper divisors (40416105).

109010991 is an frugal number, since it uses more digits than its factorization.

109010991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2022 (or 1031 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 109010991 is about 10440.8328690771. The cubic root of 109010991 is about 477.7016733517.

The spelling of 109010991 in words is "one hundred nine million, ten thousand, nine hundred ninety-one".