539

539 is a natural number that follows 538 and precedes 540. In Roman numerals it is written as DXXXIX.

In mathematics, 539 is a composite number with prime factorization 7^2 × 11. It is odd, and its divisors are 1, 7, 11, 49, 77, 539.

In base representations, 539 equals binary 1000011011, octal 1033, and hexadecimal 0x21B.

As a calendar year, 539 BCE is notable for the fall of the Neo-Babylonian Empire to Cyrus the Great, an event that ended Babylonian rule in the region and led to the subsequent return of certain exiled populations to their homelands. In the Gregorian/Julian calendar era, 539 CE is a separate year but is not associated with a widely recognized singular event in common historical summaries.

The number 539 does not have widely cited mathematical constants or prominent named sequences associated with it in common references.