Number
497 in Roman numerals
497 is written CDXCVII
Type any other number or numeral below to convert it.
Above 3,999? Type the barred part in brackets, e.g. (IV)CC = 4,200.
How CDXCVII is built
Roman numerals are written one decimal place at a time, largest first.
- CDhundreds · 4C before D means 500 − 100 = 400. This saves writing CCCC.
- XCtens · 9X before C means 100 − 10 = 90. This saves writing LXXXX.
- VIIones · 7V (5) plus II (2) makes 7.
400 + 90 + 7 = 497
The pairs CD and XC use subtraction: a smaller letter before a larger one is taken away from it. Only six pairs work this way: IV, IX, XL, XC, CD and CM. More on subtraction
Mistakes to avoid
- Not VDII. It looks like a shortcut, but V is never written before a larger letter to subtract. The correct form is CDXCVII.
- Not CCCCLXXXXVII (12 letters). That adds everything up without subtraction. The Romans sometimes wrote numbers this way, and clocks still show 4 as IIII, but today CDXCVII (7 letters) is the standard.
About the number 497
- 497 is odd and can be split into prime factors: 7 × 71, or in Roman numerals VII × LXXI.
- CDXCVII has 7 letters. 216 of the numbers up to 1,000 have longer numerals.
Counting from 491 to 500
| Number | Roman numeral |
|---|---|
| 491 | CDXCI |
| 492 | CDXCII |
| 493 | CDXCIII |
| 494 | CDXCIV |
| 495 | CDXCV |
| 496 | CDXCVI |
| 497 | CDXCVII |
| 498 | CDXCVIII |
| 499 | CDXCIX |
| 500 | D |