109091 has 6 divisors (see below), whose sum is σ = 113580. Its totient is φ = 104748.

The previous prime is 109073. The next prime is 109097. The reversal of 109091 is 190901.

It is not a de Polignac number, because 109091 - 2¹⁴ = 92707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (109097) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1820 + ... + 1878.

It is an arithmetic number, because the mean of its divisors is an integer number (18930).

2¹⁰⁹⁰⁹¹ is an apocalyptic number.

109091 is a deficient number, since it is larger than the sum of its proper divisors (4489).

109091 is an frugal number, since it uses more digits than its factorization.

109091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 109091 is about 330.2892671584. The cubic root of 109091 is about 47.7818515045.

Adding to 109091 its reverse (190901), we get a palindrome (299992).

Subtracting 109091 from its reverse (190901), we obtain a triangular number (81810 = T₄₀₄).

The spelling of 109091 in words is "one hundred nine thousand, ninety-one".