7861

7861 is a natural number that follows 7860 and precedes 7862. In mathematics, it is notable as a semiprime, being the product of two prime numbers. Specifically, 7861 = 7 × 1123, where both 7 and 1123 are prime. Consequently, the positive divisors of 7861 are 1, 7, 1123, and 7861.

In other representations, 7861 equals 1111010110101 in binary and 0x1EB5 in hexadecimal. It is odd and not a multiple of 3 or 5.

As a semiprime, 7861 is of interest in elementary number theory and can serve as an example when studying factorization, primality testing, and the distribution of semiprimes. It is not a perfect square, nor a Fibonacci number. Because 1123 is prime, the prime factorization is unique by the fundamental theorem of arithmetic.