191 (number)

191 (one hundred [and] ninety-one) is the natural number following 190 and preceding 192.

← 190 191 192 →
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Cardinalone hundred ninety-one
Ordinal191st
(one hundred ninety-first)
Factorizationprime
Primeyes
Greek numeralΡϞΑ´
Roman numeralCXCI
Binary101111112
Ternary210023
Quaternary23334
Quinary12315
Senary5156
Octal2778
Duodecimal13B12
HexadecimalBF16
Vigesimal9B20
Base 365B36

In mathematics

In astronomy

In geography

In the military

In movies

In transportation
  • RD-191, a Russian high performance single-combustion chamber rocket engine
  • 191st Street (IRT Broadway – Seventh Avenue Line), a New York City Subway station at St. Nicholas Avenue in Manhattan served by the 1 train
  • At least five known plane crashes have involved flights numbered 191; as a result, the number is considered unlucky in the airline industry and has been withdrawn from use in some airlines

In other fields

191 is also:

gollark: Its tokeniser does stemming a bit but that isn't true fuzzy searching.
gollark: Not fuzzy searching, no. It has all the bits you need but to use them you need either accursed hacks or use of irritating bits of the C API not exposed by wrappers.
gollark: Given that the merely semiworking search thing I have is ⅓ the size of the Minoteaur backend code it will likely continue to use the SQLite search forever.
gollark: Unfortunately SQLite's search capabilities are good but inflexible unless I manually deal with its C API.
gollark: It could fuzzily match spelling errors too, and people *have* been known to use multiple words for things.

See also

References
  1. "Sloane's A069132 : Centered 19-gonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-28.
  2. Wolfram MathWorld; Primitive Root
  3. "Tables of imaginary quadratic fields with small class number". numbertheory.org.
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