83121691 divided by 171 
The aim is to understand the frequency of 171 in 83121691.

Let's proceed to step 1:
171 goes into 8 0 times with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 171

On to step 2:
When dividing 83 by 171, we get 0 with a remainder of 83.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 83 after subtracting 0 from 83.
Append the next digit (1) from the dividend to 83 and continue with: 831 / 171

Going ahead to step 3:
831 divided by 171 is 4 with a remainder of 147.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 147 after subtracting 684 from 831.
Bring next digit (2) of the dividend behind the 147 and repeat the process: 1472 / 171

Advancing to step 4:
1472 divided by 171 is 8 with a remainder of 104.
Write down 8 as next digit of the result. 
Result so far: 48.0
Subtract 1368 from 1472 to get 104.
Grab the next digit (1) from the dividend, add it to 104, then carry on: 1041 / 171

Advancing to step 5:
When dividing 1041 by 171, we get 6 with a remainder of 15.
Record the quotient 6 as the next digit in the result. 
Result so far: 486.0
Subtracting 1026 from 1041 leaves us with 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 171

Step 6:
156 divided by 171 is 0 with a remainder of 156.
Write down 0 as next digit of the result. 
Result so far: 4860.0
Deduct 0 from 156 and we're left with 156.
Include the next digit (9) from the dividend after 156, then repeat: 1569 / 171

Going ahead to step 7:
The number 171 fits into 1569 9 times, leaving a remainder of 30.
Record the quotient 9 as the next digit in the result. 
Result so far: 48609.0
If we take 1539 away from 1569, we end up with 30.
Append the next digit (1) from the dividend to 30 and continue with: 301 / 171

Step 8:
171 can be fit into 301 1 times, resulting in a remainder of 130.
Use 1 as the next digit of our solution. 
Result so far: 486091.0
If we take 171 away from 301, we end up with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Going ahead to step 9:
171 goes into 1300 7 times with a remainder of 103.
The next digit of our result is 7. 
Result so far: 486091.7
Deduct 1197 from 1300 and we're left with 103.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Moving on to step 10:
If we divide 1030 by 171, we get 6 and a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 486091.76
Subtracting 1026 from 1030 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 11:
171 goes into 40 0 times with a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 486091.76
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 12:
171 goes into 400 2 times with a remainder of 58.
Use 2 as the next digit of our solution. 
Result so far: 486091.7602
Subtract 342 from 400 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 13:
If we divide 580 by 171, we get 3 and a remainder of 67.
Record the quotient 3 as the next digit in the result. 
Result so far: 486091.76023
The remainder is 67 after subtracting 513 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Moving on to step 14:
670 divided by 171 is 3 with a remainder of 157.
Record the quotient 3 as the next digit in the result. 
Result so far: 486091.760233
Deduct 513 from 670 and we're left with 157.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

The final outcome is 486091.760233, with a leftover of 1.57e-05.