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|Cardinal||two hundred ninety-one|
(two hundred ninety-first)
|Factorization||3 × 97|
Being the product of two prime numbers, 3 and 97, it is a semiprime.
It is part of five Pythagorean triples: (195, 216, 291), (291, 388, 485), (291, 4700, 4709), (291, 14112, 14115), (291, 42340, 42341).
It is a happy number.
In other fields
291 was the name of a New York City-based arts and literature magazine from 1915 to 1916, the name of which was inspired off the name of an art gallery owned by its publisher. Both names come from the gallery's address at 291 Fifth Avenue.
See also the year 291.