15151

15151 is a natural number that follows 15150 and precedes 15152. In decimal notation it is a palindrome, reading the same forwards and backwards (15151).

It is a semiprime, meaning it is the product of exactly two prime numbers. Specifically, 15151 = 109 × 139, where 109 and 139 are both prime. As a consequence, 15151 has exactly four positive divisors: 1, 109, 139, and 15151.

The number’s palindromic form and its factorization give it some typical points of interest in elementary number theory. The digits sum to 13, so the number is not divisible by 3, and since the number ends in 1, it is not divisible by 2 or 5. Being the product of two odd primes, 15151 is itself odd.

In broader mathematical contexts, numbers like 15151 are cited as examples of palindromic semiprimes in the decimal system. They illustrate how a number can simultaneously possess a symmetric digit pattern and a simple prime-factor structure. While 15151 has no widely known special applications, it serves as a small, concrete instance for studying properties of palindromes and semiprimes.