2681

2681 is a natural number that follows 2680 and precedes 2682. In mathematics, it is an odd composite number with prime factorization 7 × 383, making it a semiprime.

Consequently its divisors are 1, 7, 383 and 2681. Euler's totient φ(2681) equals (7 − 1)(383 − 1) = 6 × 382 = 2292.

Geometrically and numerically, 2681 lies between the squares 51^2 = 2601 and 52^2 = 2704.

In other representations, 2681 in binary is 101001111001, and in Roman numerals it is MMDCLXXXI. The decimal name is "two thousand six hundred eighty-one."

As a product of two primes, 2681 is often cited as an example of a semiprime in introductory number theory and is used to illustrate basic divisor structure and multiplicative functions associated with composite numbers.

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