1 in Roman Numerals
I
1 in Roman numerals is I, and is spelled one.
How to write 1 in Roman numerals
1 is written as I.
The numeral I is read from left to right, from the largest value to the smallest, adding each symbol as you go.
| Value | Roman |
|---|---|
| 1 | I |
| 1 | I |
Facts about the number 1
- 1 is an odd number.
- 1 is neither prime nor composite — it is the multiplicative identity.
- The digits of 1 add up to 1.
- 1 has 1 divisor.
- 1 is a perfect square (12).
- 1 is a perfect cube (13).
1 in other number systems
| Decimal | 1 |
| Roman | I |
| Binary | 1 |
| Octal | 1 |
| Hexadecimal | 1 |
Frequently asked questions
How do you write 1 in Roman numerals?
1 is written as I in Roman numerals.
What does the Roman numeral I mean?
I represents the number 1 (one).
Is 1 a prime number?
No — 1 is neither prime nor composite.
What is 1 in binary and hexadecimal?
1 is 1 in binary and 1 in hexadecimal.
Related numbers
Or open 1 in the converter and browse the full Roman numerals chart.