Yes, 153 is divisible by 9 because all the digits add up to 9 (i.e 1+5+3 = 9)
As a rule of thumb, add the digits of a number together. If the sum is a multiple of 9, it is divisible by nine.
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Composite - it's exactly divisible by three. 1x153 and 3x51.
It goes down to 1/17 or 1 over 17. This is because both the top and bottom are divisible by 9.
There are six such numbers: 153, 162, 171, 180, 189, 198.
1, 3, 7, 9, 17, 21, 51, 63, 119, 153, 357, 1071.
1, 3, 9, 17, 51, 131, 153, 393, 1179, 2227, 6681, 20043