CDXXXI

CDXXXI is a Roman numeral. It represents the number 431 in the Hindu-Arabic numeral system. The Roman numeral system uses letters to represent numerical values. In CDXXXI, the C represents 100, D represents 500, X represents 10, and I represents 1. The numeral is constructed by combining these values. When a smaller numeral precedes a larger numeral, it is subtracted. Thus, CD signifies 500 - 100, which equals 400. Following this, XXX represents 10 + 10 + 10, totaling 30. Finally, I represents 1. Therefore, CDXXXI is calculated as 400 + 30 + 1, resulting in 431. This numeral would typically be found in historical contexts, such as inscriptions, dates, or historical documents where Roman numerals were in common use.