9 in Roman Numerals
IX
9 in Roman numerals is IX, and is spelled nine.
How to write 9 in Roman numerals
9 is written as IX.
The numeral IX is read from left to right, from the largest value to the smallest, adding each symbol as you go. It uses subtractive notation — IX — where a smaller symbol placed before a larger one is subtracted rather than added (for example, IX means 10 − 1 = 9).
| Value | Roman |
|---|---|
| 9 | IX |
| 9 | IX |
Facts about the number 9
- 9 is an odd number.
- 9 is a composite number. Its prime factorization is 32.
- The digits of 9 add up to 9.
- 9 has 3 divisors.
- 9 is a perfect square (32).
9 in other number systems
| Decimal | 9 |
| Roman | IX |
| Binary | 1001 |
| Octal | 11 |
| Hexadecimal | 9 |
Frequently asked questions
How do you write 9 in Roman numerals?
9 is written as IX in Roman numerals.
What does the Roman numeral IX mean?
IX represents the number 9 (nine).
Is 9 a prime number?
No, 9 is a composite number.
What is 9 in binary and hexadecimal?
9 is 1001 in binary and 9 in hexadecimal.
Related numbers
Or open 9 in the converter and browse the full Roman numerals chart.