2291

2291 is a natural number that comes after 2290 and before 2292. In mathematics, it is a semiprime, being the product of two primes: 29 and 79. Its divisors are 1, 29, 79, and 2291.

In various numeral systems, 2291 is written as 0x8F3 in hexadecimal, 100011110011 in binary, and 4363 in octal. In Roman numerals it is MMCCXCI.

As a calendar year, 2291 CE would fall in the late 23rd century and is not a leap year in the Gregorian calendar. There are no widely cited historical events associated with this year in real history, given its distant future status, though it is occasionally used in science fiction as a setting for near-future technologies or space exploration.

Beyond calendrical usage, 2291 is sometimes used as a catalog or model number in various domains, reflecting its role as a stable, two-prime composite. The number has no universally known special significance beyond its mathematical properties and ordinary use as an identifier.