convert number (integer) into hour:minute:seconds

I am trying to convert a column of numbers into hours:minutes:seconds.

For example, I have following numbers (original data followed by desired output). I tried using the custom number format but could not get the desired result. Any assistance appreciated.

9 - convert to :09
53 - convert to :53
68 - convert to 1:08
109 - convert to 1:49
121 - convert to 2:01
262 - convert to 4:22