We look at the division of 87649129 by 131 
The aim is to understand the frequency of 131 in 87649129.

Step 1:
131 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 131

On to step 2:
87 divided by 131 is 0 with a remainder of 87.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 87, we get 87.
Append the next digit (6) from the dividend to 87 and continue with: 876 / 131

Moving on to step 3:
The number 131 fits into 876 6 times, leaving a remainder of 90.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
The remainder is 90 after subtracting 786 from 876.
Grab the next digit (4) from the dividend, add it to 90, then carry on: 904 / 131

Advancing to step 4:
When dividing 904 by 131, we get 6 with a remainder of 118.
Record the quotient 6 as the next digit in the result. 
Result so far: 66.0
Subtract 786 from 904 to get 118.
Grab the next digit (9) from the dividend, add it to 118, then carry on: 1189 / 131

Let's proceed to step 5:
131 goes into 1189 9 times with a remainder of 10.
The next digit of our result is 9. 
Result so far: 669.0
If we subtract 1179 from 1189, we get 10.
Include the next digit (1) from the dividend after 10, then repeat: 101 / 131

Moving on to step 6:
When dividing 101 by 131, we get 0 with a remainder of 101.
The number 0 becomes the next digit in our result. 
Result so far: 6690.0
Subtracting 0 from 101 leaves us with 101.
Grab the next digit (2) from the dividend, add it to 101, then carry on: 1012 / 131

Moving on to step 7:
1012 divided by 131 is 7 with a remainder of 95.
Write down 7 as next digit of the result. 
Result so far: 66907.0
If we subtract 917 from 1012, we get 95.
Take the next digit (9) from the dividend and append it to 95, then repeat: 959 / 131

Moving on to step 8:
131 can be fit into 959 7 times, resulting in a remainder of 42.
Put 7 as the next digit of the answer. 
Result so far: 669077.0
If we subtract 917 from 959, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 9:
The number 131 fits into 420 3 times, leaving a remainder of 27.
Use 3 as the next digit of our solution. 
Result so far: 669077.3
Subtracting 393 from 420 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 10:
131 can be fit into 270 2 times, resulting in a remainder of 8.
Write down 2 as next digit of the result. 
Result so far: 669077.32
Subtracting 262 from 270 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 11:
131 can be fit into 80 0 times, resulting in a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 669077.32
If we take 0 away from 80, we end up with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 12:
If we divide 800 by 131, we get 6 and a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 669077.3206
Subtracting 786 from 800 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 13:
The number 131 fits into 140 1 times, leaving a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 669077.32061
If we take 131 away from 140, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 14:
If we divide 90 by 131, we get 0 and a remainder of 90.
The next digit of our result is 0. 
Result so far: 669077.32061
Subtracting 0 from 90 leaves us with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

On to step 15:
131 can be fit into 900 6 times, resulting in a remainder of 114.
Use 6 as the next digit of our solution. 
Result so far: 669077.3206106
If we take 786 away from 900, we end up with 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Moving on to step 16:
131 can be fit into 1140 8 times, resulting in a remainder of 92.
Put 8 as the next digit of the answer. 
Result so far: 669077.32061068
Deduct 1048 from 1140 and we're left with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

The final outcome is 669077.32061068, with a leftover of 9.2e-08.