The number 291 is an integer that follows 290 and precedes 292. It is an odd number and can be expressed as the sum of two prime numbers: 281 and 10. In mathematics, it is often used in various calculations and can be found in different contexts, such as statistics and number theory. In terms of its significance, 291 can also refer to specific codes or identifiers, such as area codes or postal codes. Additionally, it may appear in historical contexts, like the year 291 AD, which was notable for events in the Roman Empire.