109009591 has 4 divisors (see below), whose sum is σ = 111328992. Its totient is φ = 106690192.

The previous prime is 109009583. The next prime is 109009597. The reversal of 109009591 is 195900901.

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

It is a cyclic number.

It is not a de Polignac number, because 109009591 - 2³ = 109009583 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109009597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1159630 + ... + 1159723.

It is an arithmetic number, because the mean of its divisors is an integer number (27832248).

Almost surely, 2^109009591 is an apocalyptic number.

109009591 is a deficient number, since it is larger than the sum of its proper divisors (2319401).

109009591 is an equidigital number, since it uses as much as digits as its factorization.

109009591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2319400.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 109009591 is about 10440.7658244020. The cubic root of 109009591 is about 477.6996283432.

The spelling of 109009591 in words is "one hundred nine million, nine thousand, five hundred ninety-one".