### About the Number 911 (nine hundred eleven)

This number BAB was created on the 7th anniversity of 911 (i.e. 11 September 2001).

```   MathBabbler Number Analyst (MBNA) output:
=========================================
911 is a natural, whole, integer
911 is odd
911 proper divisors are: 1
911 is deficient (sum of divisors is 1)
911 is unhappy
911 is not a Harshad number
911 is prime
...Cousin prime with 907
...Sophie Germain prime with 1823
...OEIS:002145 (4n+3; n=227)
911 in octal is 01617
911 in hexadecimal is 0x38f
911 in binary is 1110001111 (is odious)
911 nearest square numbers: -11...50 (900 ...961 )
sqrt(911) = 30.1828
ln(911) = 6.81454
log(911) = 2.95952
911 reciprocal is .00109769484083424807903402854006
911! is 2.27959e+2302
911 is 289.98 Pi years
911 is 45 score and 11 years
```

`911` in Roman numeral is `CMXI`.

`911` is the emergency telephone number in the U.S.

`911 = (112)2 * 102 + 101 + 100`

##### Update::2010.01.20

MathBabbler was checking stock quotes and he saw that Google (nasdaq: GOOG) was down \$9.11. 9.11 is not `911`, but is centi-`911` (i.e. 10^-2*`911`).

`[NumDic.com]` `911` = 456^2 - 455^2 and 456 + 455 = `911`

`[exercise: solve for n]` `9.11 = 911 / n`

`[exercise: solve for (112)2]` `911 = (112)2 * 102 + 101 + 100`

Creator: Gerald Thurman [gthurman@gmail.com]
Created: 11 September 2008 