109591 has 4 divisors (see below), whose sum is σ = 113400. Its totient is φ = 105784.

The previous prime is 109589. The next prime is 109597. The reversal of 109591 is 195901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 195901 = 227 ⋅863.

It is a cyclic number.

It is not a de Polignac number, because 109591 - 2¹ = 109589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109597) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1861 + ... + 1918.

It is an arithmetic number, because the mean of its divisors is an integer number (28350).

2¹⁰⁹⁵⁹¹ is an apocalyptic number.

109591 is a deficient number, since it is larger than the sum of its proper divisors (3809).

109591 is an equidigital number, since it uses as much as digits as its factorization.

109591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3808.

The product of its (nonzero) digits is 405, while the sum is 25.

The square root of 109591 is about 331.0453141188. The cubic root of 109591 is about 47.8547402500.

The spelling of 109591 in words is "one hundred nine thousand, five hundred ninety-one".