September, the ninth month of the year, is the only month in the English language whose number of letters in the name corresponds to the number of the month
The sum of the digits of any multiple of nine is nine
The digits within any number that is divisible by nine can be rearranged in any orientation, and the resulting number will still be divisible by nine
There are 9 major planets in the solar system
Beethoven wrote 9 symphonies
Putting the digit nine into any number does not change the sum of the digits of that number
Toss a nine into any multiple of nine, in any part of the number, and the resulting number will still be a multiple of nine