291 (number)
291 (two hundred [and] ninety one) is the natural number following 290 and preceding 292.
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| Cardinal | two hundred ninety-one | |||
| Ordinal | 291st (two hundred ninety-first) | |||
| Factorization | 3 × 97 | |||
| Greek numeral | ΣϞΑ´ | |||
| Roman numeral | CCXCI | |||
| Binary | 1001000112 | |||
| Ternary | 1012103 | |||
| Octal | 4438 | |||
| Duodecimal | 20312 | |||
| Hexadecimal | 12316 | |||
In mathematics
This number is the product of four divisors: 1, 3, 97 and 291. The sum of its proper divisors (its aliquot sum) is less than 291, making it a deficient number.
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 palindrome in base 9: 353.
It is a happy number.
It is the 159th congruent number.[1]
It is the sum of the 52nd prime number, 239, and 52, making it part of the series.[2]
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.
291 Alice is a main belt asteroid discovered in 1890.
See also the year 291.
gollark: One alternative interpretation I read somewhere was coordination problems - people don't do much because they feel like it won't be useful unless other people also do.
gollark: I'm not saying that they shouldn't care, to clarify, but that people don't, telling them their preferences are wrong is not really a winning strategy, and the lack of concern of most richer countries for poorer ones reflects most people's demonstrated attitudes.
gollark: Yes, exactly.
gollark: (also, global prosperity is generally going up, illiteracy & extreme poverty going down, etc.)
gollark: Anyway, I find those "various people die of easily preventable deaths → capitalism bad" things unreasonable. I suspect most people don't actually *care* about random people somewhere dying, given the fact that you can quite easily donate to very effective charities for e.g. helping fix malaria under the existing system, and yet nobody does this.
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