One Hundred Nine is a natural number that follows One Hundred Eight and precedes One Hundred Ten. It is an odd number and can be expressed in Roman numerals as CIX. In mathematics, it is often used in various calculations and can be found in sequences and patterns. In terms of its properties, One Hundred Nine is a prime number, meaning it has no divisors other than 1 and itself. This characteristic makes it significant in number theory and various applications, including cryptography and computer science, where prime numbers play a crucial role.