Discover a lot of information on the number 9: properties, mathematical operations, how to write it, symbolism, numerology, representations and many other interesting things!
Numerology and symbolism of the number 9
The number 9 (nine) represents humanity, altruism. It symbolizes generosity, idealism and humanitarian vocations.
Mathematical properties of 9
Questions and answers |
Is 9 a prime number? |
No |
Is 9 a perfect number? |
No |
Number of divisors |
3 |
List of dividers |
1, 3, 9 |
Sum of divisors |
13 |
Prime factorization |
32 |
Prime factors |
3 |
How to write / spell 9 in letters?
In letters, the number 9 is written as: Nine. And in other languages? how does it spell?
9 in other languages |
Write 9 in english |
Nine |
Write 9 in french |
Neuf |
Write 9 in spanish |
Nueve |
Write 9 in portuguese |
Nove |
Mathematical representations and links
Other ways to write 9 |
In letter |
Nine |
In roman numeral |
IX |
In binary |
1001 |
In octal |
11 |
In hexadecimal |
9 |
In US dollars |
USD 9.00 ($) |
In euros |
9,00 EUR (€) |
Some related numbers |
Previous number |
8 |
Next number |
10 |
Next prime number |
11 |
Mathematical operations
Operations and solutions |
9*2 |
= |
18 |
The double of 9 is 18 |
9*3 |
= |
27 |
The triple of 9 is 27 |
9/2 |
= |
4.5 |
The half of 9 is 4.500000 |
9/3 |
= |
3 |
The third of 9 is 3.000000 |
92 |
= |
81 |
The square of 9 is 81.000000 |
93 |
= |
729 |
The cube of 9 is 729.000000 |
√9 |
= |
3 |
The square root of 9 is 3.000000 |
log(9) |
= |
2.1972245773362 |
The natural (Neperian) logarithm of 9 is 2.197225 |
log10(9) |
= |
0.95424250943932 |
The decimal logarithm (base 10) of 9 is 0.954243 |
sin(9) |
= |
0.41211848524176 |
The sine of 9 is 0.412118 |
cos(9) |
= |
-0.91113026188468 |
The cosine of 9 is -0.911130 |
tan(9) |
= |
-0.45231565944181 |
The tangent of 9 is -0.452316 |