9913

9913 is a natural number, coming after 9912 and before 9914. In decimal notation it is a four-digit odd number positioned near 10,000.

In mathematics, 9913 is a composite number with the prime factorization 9913 = 23 × 431. Both 23 and 431 are prime, so 9913 is a semiprime (the product of exactly two primes). This makes it non-prime and not a perfect square.

Other basic properties include its odd parity and its digits summing to 22, giving a digital root of 4. It is congruent to 1 modulo 3 and also congruent to 1 modulo 8, consistent with the product of the prime factors (23 ≡ 7 and 431 ≡ 7 mod 8, and 7 × 7 ≡ 1 mod 8).

Representations in other bases include binary, octal, and hexadecimal. In binary, 9913 is 10011010111001. In octal it is 23271, and in hexadecimal it is 0x26B9.

Because it factors into two distinct primes, 9913 serves as an example of a semiprime in number theory. Beyond its role as a numerical value, there are no widely recognized mathematical constants, theorems, or cultural references specifically associated with 9913.