15251

15251 is a natural number. In base 10 it is a five-digit palindrome, reading the same forwards and backwards as 15251, and it lies between 15250 and 15252.

Its prime factorization is 15251 = 101 × 151, with both factors being prime. As a product of two primes, 15251 is classified as a semiprime. It is also a palindromic composite in decimal notation.

In addition to being a palindrome and a semiprime, 15251 has several simple arithmetic properties. It is odd, and the sum of its digits is 14, so it is not divisible by 3. The number is congruent to 2 modulo 3 and to 3 modulo 4. It is not a perfect square.

In mathematical usage, 15251 is often noted as an illustrative example of a palindromic semiprime. Its factorization into two relatively nearby primes (101 and 151) makes it a convenient case for introductory discussions of prime products, without involving extremely large numbers used in cryptography. See also palindromic numbers, semiprimes, and natural numbers.