The number 149 is classified as a prime number, meaning it has no positive divisors other than 1 and itself. This characteristic makes it unique among integers, as prime numbers are the building blocks of all whole numbers. The next prime number after 149 is 151. In addition to its mathematical properties, 149 can be found in various contexts, such as in science and history. For example, it is the atomic number of unbium, a hypothetical element. Understanding prime numbers like 149 is essential in fields such as cryptography and number theory.