51191 ÷ 9 = 5687 R8
Alright, let's work through the division of 51191 by 9 step by step.

Step 1:
9 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 5 to get 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 9

Step 2:
9 goes into 51 5 times with a remainder of 6.
Write down 5 as next digit of of the result. 
Result so far: 5
Subtract 45 from 51 to get 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 9

Step 3:
9 goes into 61 6 times with a remainder of 7.
Write down 6 as next digit of of the result. 
Result so far: 56
Subtract 54 from 61 to get 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 9

Step 4:
9 goes into 79 8 times with a remainder of 7.
Write down 8 as next digit of of the result. 
Result so far: 568
Subtract 72 from 79 to get 7.
Bring next digit (1) of the dividend behind the 7 and repeat the process: 71 / 9

Step 5:
9 goes into 71 7 times with a remainder of 8.
Write down 7 as next digit of of the result. 
Result so far: 5687
Subtract 63 from 71 to get 8.

The final result is 5687 with a remainder of 8.