2643

2643 is the natural number that comes after 2642 and before 2644. It is an odd composite integer.

Its prime factorization is 3 × 881, with 881 prime, making 2643 a semiprime.

In different numeral systems, 2643 is represented as decimal 2643, hexadecimal A53, and binary 101001010011. In Roman numerals it is MMDCXLIII.

Properties of 2643 include that the digits sum to 15, so the number is divisible by 3 but not by 9. It is not a Harshad number in base 10. As a result, 2643 does not divide evenly by the sum of its digits, unlike some other integers.