9977

9977 is a natural number that follows 9976 and precedes 9978. It is a four-digit, odd, composite number and is typically studied as an example in basic number theory.

The prime factorization of 9977 is 11 × 907, where 11 and 907 are primes. Because it is the product of two primes, 9977 is a semiprime. Its divisors are 1, 11, 907, and 9977.

In decimal notation, 9977 has the digits 9, 9, 7, 7. The digit sum is 32, giving a digital root of 5. The number is congruent to 1 modulo 4 and 5 modulo 9. It is not a perfect power and, due to having two prime factors each congruent to 3 modulo 4 with odd exponents, cannot be expressed as a sum of two squares.

As a small semiprime, 9977 is sometimes used in introductory demonstrations of factorization and the properties of composite numbers. Beyond arithmetic features, there are no widely recognized mathematical constants or theorems specifically associated with 9977.