-243 is an odd number.
-243 is a Harshad number, which means it is divisible by the sum of its digits (2 + 4 + 3 = 9, and -243 is divisible by 9).
In binary, -243 is represented as 1111111111111111111111111111111111111111111111111111111100001101.
In hex, -243 is represented as ffffffffffffff0d.