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100011 is the smallest 6 digit number exactly divisible by 111
1 5 1
I think it is 100011
test of divisibility of 111 
make groups of 3 digits from the end 
100 011 
add the groups 
100 + 011 = 111 
divide the sum by 111 if it is divisible then given number is divisible by 111 
so here is the answer :)