Number 9 in British English words is nine.
Number consists of 1 digit, one-digit.

Number 9 in American English words is nine, in German words is neun, in French words is neuf, in Spanish words is nueve, in Italian words is nove, in Dutch words is negen, in Danish words is ni.
If you want to write in words the number 9, it is necessary to use 4 characters.

Number 9 in binary code can be written 1001.

Number 9 in octal code can be written 11.

Number 9 in hexadecimal code can be written 9.

Number 9 in Roman numerals is IX.

Unix timestamp 9 converted to human readable date and time is Thursday January 1, 1970, 3:00 AM.

Decimal IP address 9 converted to dotted-decimal format is 0.0.0.9.

The square root of 9 is 3.
Number 9 multiplied by 2 equals 18.
Divided by 2 equals 4.5.
The sum of all digits equals 9.
Number 9 raised to the power of 2 is 81.
Number 9 raised to the power of 3 is 729.

The cosine of number 9 is -0.91113026188468.
The sine of number 9 is 0.41211848524176.
The tangent of number 9 is -0.45231565944181.
The radian equivalent of number 9 is 0.15707963267949.
The equivalent of number 9 in degrees is 515.66201561774.
The base-10 logarithm of number 9 is 0.95424250943932.

This number is odd number (an integer that is not evenly divisible by 2).
Number 9 is not a prime number.