Subtracting from 2643 its sum of digits (15), we obtain a triangular number (2628 = T72).
Adding to 2643 its reverse (3462), we get a triangular number (6105 = T110).
2643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is a D-number.
It is a plaindrome in base 9.
It is a nialpdrome in base 15 and base 16.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 2643.
22643 is an apocalyptic number.
2643 is an equidigital number, since it uses as much as digits as its factorization.
2643 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 884.
The square root of 2643 is about 51.4101157361. The cubic root of 2643 is about 13.8260796474.
The spelling of 2643 in words is "two thousand, six hundred forty-three".