What does CCXCI mean?

CCXCI is the Roman numeral for 291 — 100 + 100 + 90 + 1.

How do you write 291 in Roman numerals?

Take the largest value that fits and repeat until nothing is left: C (100), then C (100), then XC (90), then I (1). That gives CCXCI.

291 in Roman numerals

CCXCI

Number (1–3,999 for numerals)

Roman numeral

291 is written CCXCI in Roman numerals. That is 4 symbol groups added together, reading left to right from the largest value down.

How it breaks down

CCXCI = 100 + 100 + 90 + 1 = 291
Group	Value	Subtraction	Running total
C	100	—	100
C	100	—	200
XC	90	C − X	290
I	1	—	291

Why the smaller symbol comes first

CCXCI uses subtractive notation in one place: XC means C minus X, or 90. A smaller symbol placed before a larger one is subtracted from it rather than added, which is why IX is nine and not eleven.

Only six such pairs are valid — IV, IX, XL, XC, CD and CM. That restriction is what makes the notation unambiguous: IIII and IC both look like they should work, but neither is standard, and only one spelling of any number is correct.

The symbols

Symbol	Value	Used here
I	1	yes — 1×
V	5	no
X	10	yes — 1×
L	50	no
C	100	yes — 3×
D	500	no
M	1,000	no

The same number, other ways

In words: Two hundred ninety-one
Roman numeral: CCXCI
Symbol count: 5 characters
Binary: 100100011
Hexadecimal: 123

The numbers either side

Number	Roman numeral
289	CCLXXXIX
290	CCXC
291	CCXCI ←
292	CCXCII
293	CCXCIII

Common questions

What is 291 in Roman numerals?: 291 is CCXCI.
What does CCXCI mean?: CCXCI is the Roman numeral for 291 — 100 + 100 + 90 + 1.
How do you write 291 in Roman numerals?: Take the largest value that fits and repeat until nothing is left: C (100), then C (100), then XC (90), then I (1). That gives CCXCI.

Sources

Calculated on this page — At One Place

How these figures are compiled and checked