911 (number)
911 (nine hundred eleven) is the number following 910 and preceding 912.
| |||
| 911 | |||
|---|---|---|---|
| Cardinal | Nine hundred eleven | ||
| Ordinal | 911th | ||
| Factorization | Prime | ||
| Roman numeral | CMXI | ||
| Binary | 1110001111 | ||
| Hexadecimal | 38F | ||
It is a prime number, a Sophie Germain prime and the sum of three consecutive primes (293 + 307 + 311). It is an Eisenstein prime with no imaginary part and real part of the form <math>3n - 1</math>. Since 913 is a semiprime, 911 is a Chen prime. It is also a centered decagonal number.
911 or 9/11, typically pronounced "nine-eleven", is commonly used to refer the calendar date 9 November, or September 11 where middle endian date notations are used. The latter usage most commonly refers to the September 11, 2001 attacks in the United States that sparked the War on Terrorism, or more rarely the 1973 US-backed coup d'etat of Chile. Related uses include the titles of the following films:
- Fahrenheit 9/11
- 9/11: The Road to Tyranny
- Martial Law 9/11: Rise of the Police State
- 9/11: The Great Illusion
- 9/11: In Plane Site
- 9/11: Another World Is Possible
911 can also refer to:
- 9-1-1, the emergency telephone number in the United States and Canada, analogous to 1-1-2 in the European Union and on GSM cellphones.
- 911 (musical group)
- the model number of the sports car Porsche 911
- 911 or Al Poling, a professional wrestler.
- the year 911 or 911 BC.ja:911