86391 ÷ 9 = 9599 R0
No problem, we've got 86391 and 9 for the division.

Step 1:
9 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 8 to get 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 9

Step 2:
9 goes into 86 9 times with a remainder of 5.
Write down 9 as next digit of of the result. 
Result so far: 9
Subtract 81 from 86 to get 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 9

Step 3:
9 goes into 53 5 times with a remainder of 8.
Write down 5 as next digit of of the result. 
Result so far: 95
Subtract 45 from 53 to get 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 9

Step 4:
9 goes into 89 9 times with a remainder of 8.
Write down 9 as next digit of of the result. 
Result so far: 959
Subtract 81 from 89 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 9

Step 5:
9 goes into 81 9 times with a remainder of 0.
Write down 9 as next digit of of the result. 
Result so far: 9599
Subtract 81 from 81 to get 0.

The final result is 9599 with a remainder of 0.