108509 has 4 divisors (see below), whose sum is σ = 114240. Its totient is φ = 102780.

The previous prime is 108503. The next prime is 108517. The reversal of 108509 is 905801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905801 = 13 ⋅69677.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108509 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 108509.

It is not an unprimeable number, because it can be changed into a prime (108503) 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, 2837 + ... + 2874.

It is an arithmetic number, because the mean of its divisors is an integer number (28560).

2¹⁰⁸⁵⁰⁹ is an apocalyptic number.

108509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

108509 is a deficient number, since it is larger than the sum of its proper divisors (5731).

108509 is an equidigital number, since it uses as much as digits as its factorization.

108509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5730.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 108509 is about 329.4070430334. The cubic root of 108509 is about 47.6967279582.

The spelling of 108509 in words is "one hundred eight thousand, five hundred nine".