997 in Roman Numerals
997
C (subtracted)MX (subtracted)CVII
nine hundred ninety-seven
How CMXCVII is formed
| Place | Value | Symbols |
|---|---|---|
| Hundreds | 900 | C (subtracted)M |
| Tens | 90 | X (subtracted)C |
| Units | 7 | VII |
| Total | 997 | CMXCVII |
CMXCVII is written one place at a time, from the largest to the smallest: CM (900) + XC (90) + VII (7) = 997.
CM and XC are subtractive pairs: in each one the smaller symbol comes first and is taken away.
Common mistakes
Wrong: DCCCCXCVII
Why isn't 997 written as DCCCCXCVII?
A symbol can't be repeated four times in a row. 900 is CM (1000 − 100), not DCCCC, so 997 is CMXCVII.
Wrong: CMLXXXXVII
Why isn't 997 written as CMLXXXXVII?
A symbol can't be repeated four times in a row. 90 is XC (100 − 10), not LXXXX, so 997 is CMXCVII.
Wrong: DCCCCLXXXXVII
Why isn't 997 written as DCCCCLXXXXVII?
No symbol can be repeated four times in a row, so DCCCC and LXXXX are not used: 900 = CM, 90 = XC. Together they make CMXCVII.
Numbers near 997
Properties of 997
- Prime factors
- 997
- Divisors
- 1, 997
- Even or odd
- Odd
- Prime number
- Yes
- Letters in CMXCVII
- 7
997 is a prime number: it can only be divided by 1 and by itself.
997,000 in Roman numerals
With a bar over it (vinculum), C̅M̅X̅C̅V̅I̅I̅ means 997 × 1,000 = 997,000. How Roman numerals work