The number "251" is an integer that follows 250 and precedes 252. It is an odd number and can be classified as a composite number, meaning it has divisors other than 1 and itself. The prime factorization of 251 is 251 × 1, indicating that it is a prime number. In mathematics, "251" can also represent various concepts, such as a point on a number line or a quantity in a set. In the context of area codes, 251 is the area code for parts of Alabama, including cities like Mobile and Daphne.