9 (number)

9 (nine) is the Arabic number which comes after 8, before 10, and two before eleven. It is an odd number, and is the highest single-digit number.  It is also a square number. In Roman numerals, nine can be written as IX.

The number also looks like an inverted 6. To tell the difference between the two, they are often underlined.

 Mathematics 
The number nine (9) takes the shape of an upside-down six (6), is a multiple of 3, and the third square number after 4.

Nine is also a composite number, having the factors: 1, 3 and 9 itself. Nine is the first odd composite numberCategory:Square numbers
Category:Integers