Discover a lot of information on the number 11: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!

## Mathematical properties of 11

Is 11 a prime number? Yes
Is 11 a perfect number? No
Number of divisors 2
List of dividers 1, 11
Sum of divisors 12

## How to write / spell 11 in letters?

In letters, the number 11 is written as: Eleven. And in other languages? how does it spell?

11 in other languages
Write 11 in english Eleven
Write 11 in french Onze
Write 11 in spanish Once
Write 11 in portuguese Onze

## Decomposition of the number 11

The number 11 is composed of:

2 iterations of the number 1 : The number 1 (one) represents the uniqueness, the unique, a starting point, a beginning.... Find out more about the number 1

Other ways to write 11
In letter Eleven
In roman numeral XI
In binary 1011
In octal 13
In US dollars USD 11.00 (\$)
In euros 11,00 EUR (€)
Some related numbers
Previous number 10
Next number 12
Next prime number 13

## Mathematical operations

Operations and solutions
11*2 = 22 The double of 11 is 22
11*3 = 33 The triple of 11 is 33
11/2 = 5.5 The half of 11 is 5.500000
11/3 = 3.6666666666667 The third of 11 is 3.666667
112 = 121 The square of 11 is 121.000000
113 = 1331 The cube of 11 is 1331.000000
√11 = 3.3166247903554 The square root of 11 is 3.316625
log(11) = 2.3978952727984 The natural (Neperian) logarithm of 11 is 2.397895
log10(11) = 1.0413926851582 The decimal logarithm (base 10) of 11 is 1.041393
sin(11) = -0.9999902065507 The sine of 11 is -0.999990
cos(11) = 0.0044256979880508 The cosine of 11 is 0.004426
tan(11) = -225.9508464542 The tangent of 11 is -225.950846