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: There isn't time gating like that, although you need several billion RF stored and/or several tens of kRF/t of production to start up a reactor.
gollark: The hard part is that the electromagnets require large amounts of *somewhat* annoying to get resources (tough alloy), and the "fusion core" requires elite plating, requiring a bunch of uranium-238 and "crystal binder", which requires "calcium sulfate" which requires a large complex chemical processing setup.
gollark: NuclearCraft has fusion reactors which I've made a few times. They need a lot of resources and also *somewhat* hard to make stuff.
gollark: The faucet things are effectively liquid pipes activated by rightclicking and redstone, which is... something.
gollark: I haven't actually seen/used IC2 machines since probably the 1.7.10 days.
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