CXLV is a Roman numeral that represents the number 145. In the Roman numeral system, C stands for 100, L stands for 50, and V stands for 5. The combination of these symbols indicates that you add 100 and 50, then add 5, resulting in a total of 145. The number 145 can also be expressed in various mathematical forms. For example, it is an odd number and can be factored into prime numbers as 5 × 29. Additionally, in the context of mathematics, 145 is significant as it is the sum of the first 12 prime numbers.