| Base 10 | 11 (2 digits) | ||
| Digit Sum: 2 | Digital Root: 2 | sad | |
| Base 2 | 0b1011 (4 digits) | ||
| Digit Sum: 0b11 | Digital Root: 0b1 | always happy | |
| Base 8 | 013 (2 digits) | ||
| Digit Sum: 04 | Digital Root: 04 | sad | |
| Base 16 | 0xb (1 digit) | ||
| Digit Sum: 0xb | Digital Root: 0xb | happy | |
More about this number at Positiv Integers and Number Empire.
The number is a prime
It is a Sophie Germain Prime since 23 is prime
It is a Safe Prime since 5 is prime
It is a Twin prime for 13.
It is a Cousin prime for 7.
It is a Sexy prime for 5 and 17.
| In HTML this number represents this color: | 
 ⇧↑⇧↑⇧↑ #00000B ⇩↓⇩↓⇩↓  | 
In the work of Johann Sebastian Bach BWV 11 is Lobet Gott in seinen Reichen (Himmelfahrts-Oratorium)
The number appears at position 94 of the decimal digits of π surrounded by
862089986280348253421170679821480865132823 Source: The Pi-Search Page
Computations done with Math::BigInt 1.999811 and Math::Pari 2.030523 based on PARI/GP 2.11.3 (elapsed: 731.101ms; cpu: 171.794ms)