6155

6155 is a natural number that follows 6154 and precedes 6156. It is an odd, composite number. The prime factorization of 6155 is 5 × 1231, where 1231 is prime, so 6155 is a semiprime. Because it ends in 5, it is divisible by 5 and therefore not prime. The positive divisors of 6155 are 1, 5, 1231, and 6155, giving it four divisors in total.

The sum of its decimal digits is 17, which means 6155 is not divisible by 3 or 9. It is congruent to 3 modulo 4, a property that implies it cannot be expressed as the sum of two integer squares. In modular arithmetic, 6155 is also congruent to 3 modulo 8.

In general terms, 6155 serves as an example of a small semiprime: a product of exactly two primes. Its factorization structure—composed of one small prime (5) and one larger prime (1231)—is typical of many semiprimes used in mathematical discussions of divisor functions and factorization patterns. Beyond its role as a member of the natural numbers and as a semiprime, 6155 does not have a widely noted special status in number theory. It shares the common traits of nearby integers: it is odd, composite, and has a divisor structure that is straightforward to enumerate.