CCLXIX

CCLXIX is the Roman numeral for the integer 269. It is formed by adding C (100) + C (100) + L (50) + X (10) + IX (9), using the subtractive notation IX for nine.

Mathematically, 269 is a prime number. It is the 57th prime, and it is odd with only 1 and itself as positive divisors. As a prime, it has no divisors other than 1 and 269, which is a defining property in number theory.

Historically, 269 AD was a year in the late Roman Empire, occurring during the Crisis of the Third Century, a period of political and military turmoil. 269 BCE marks a point in the pre-Julian Roman calendar. As with many integers, 269 can appear in various year-designations, chronology, and inscriptions that use Roman numerals.

Calendrically, 269 is the day of the year in the common year and leap year system: in common years the 269th day is September 26, while in leap years it is September 25. Beyond calendars, 269 commonly appears in modern contexts as a plain numerical value in cataloging, numbering, and identifiers.

In modern usage, 269 also appears as an international dialing code (for example, +269 for the Comoros), illustrating how the same number features in both historical numeral systems and contemporary telecommunication.