Yes....The thing that is special about the #9 is that..........If you flip it it becomes a 6......and.......it's a composite number......which means it can be equally divided into numbers other than 1 and itself.....That other number is 3.
ALSO...
If you keep adding up all the digits of any of the multiples of 9 (including their intermediate sums) - they eventually add up to 9.
Examples:
18 breaks down to: 1 + 8 which adds up to 9 or
27 breaks down to: 2 + 7 which adds up to 9 or
5110092 (which is 9 x 567788) breaks down to: 5+1+1+0+0+9+2 adds up to 18, which breaks down into 1 + 8, which adds up to 18 which adds up to (guess what!) 9.
Try it yourself with any multiple of 9!
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9 can be broken down into 3 and 3, however you cannot multiply anything by anything to get 19.
All the digits add up to 9 so therefore it is divisible by 9: 27720/9 = 3080.
Anything over 2. Some, eg triangle, are special cases...
It is an even number and contains all the digits from 1 to 9
It contains the numbers 1 to 9 in alphabetic order,