2761

2761 is a natural number that follows 2760 and precedes 2762. It is odd and its decimal representation is 2761.

In number theory, 2761 factors as 11 × 251, so it is a semiprime (the product of two primes). Both prime factors are congruent to 3 modulo 4, which makes 2761 a Blum integer. Blum integers are of interest in certain cryptographic constructions.

Its divisors are 1, 11, 251, and 2761. Euler's totient is φ(2761) = 2500, and the sum of its divisors is σ(2761) = 3024. Because it has two distinct primes of the form 4k+3, 2761 cannot be expressed as a sum of two squares.

In other representations, 2761 is written in Roman numerals as MMDCCLXI. In binary, it is 101011001001, and in hexadecimal, it is 0xAC9. These representations reflect its identity as a composite number with a simple prime factorization.

Summary points: 2761 = 11 × 251 (a Blum semiprime), four divisors {1, 11, 251, 2761}, φ(2761) = 2500, σ(2761) = 3024, Roman numeral MMDCCLXI, binary 101011001001, hex 0xAC9.