191 (number)
Encyclopedia : 1 : 19 : 191 : 191 (number)
191 is the natural number between 190 and 192. It is also a prime number.
| |||
| Ordinal | One hundred [and] ninety-one | ||
| Cardinal | 191st | ||
| Factorization | prime number | ||
| Roman numeral | CXCI | ||
| Binary | 10111111 | ||
| Hexadecimal | BF | ||
In mathematics
191 is a prime number, a Sophie Germain prime, a Chen prime and a twin prime with 193. It is also a Thabit number and an Eisenstein prime with no imaginary part. 191 is the index of the Wagstaff prime 1046183622564446793972631570534611069350392574077339085483.
In base 10, it is a palindromic prime.
In other fields
There are 191 member states of the United Nations.
Several aircraft operating under the flight number of 191 have crashed. These include Prinair Flight 191, Delta Air Lines Flight 191, X-15 Flight 191, and American Airlines Flight 191 which was then the most deadly commercial airline crash in US history.
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