7149

7149 is a natural number that sits between 7148 and 7150. In mathematics it has several notable properties.

Its prime factorization is 3 × 2383, with 2383 prime, which makes 7149 a semiprime. Because both prime factors are congruent to 3 modulo 4 (3 ≡ 3 mod 4 and 2383 ≡ 3 mod 4), 7149 is a Blum integer, a class of semiprimes used in certain cryptographic discussions. Its divisors are 1, 3, 2383, and 7149. The Euler totient is φ(7149) = (3−1)(2383−1) = 4764, and the sum of its positive divisors is σ(7149) = 9536. It has four divisors in total and is an odd number.

In various bases, 7149 has the representations: binary 1101111101101, octal 15755, and hexadecimal 0x1BED.

In broader usage, 7149 is often cited as an example of a Blum integer in discussions of cryptographic concepts that rely on the difficulty of factoring semiprimes. In computer networking, 7149 is not associated with a widely standardized service and may be used as a dynamic or local port in practice.