We look at the division of 516491 by 1 
We're looking to find how many times 1 goes into 516491.

Let's proceed to step 1:
The number 1 fits into 5 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 5 from 5 leaves us with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

On to step 2:
When dividing 1 by 1, we get 1 with a remainder of 0.
The next digit of our result is 1. 
Result so far: 51.0
If we subtract 1 from 1, we get 0.
Include the next digit (6) from the dividend after 0, then repeat: 6 / 1

Let's proceed to step 3:
6 divided by 1 is 6 with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 516.0
If we take 6 away from 6, we end up with 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 1

Step 4:
The number 1 fits into 4 4 times, leaving a remainder of 0.
The next digit of our result is 4. 
Result so far: 5164.0
The remainder is 0 after subtracting 4 from 4.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 1

Going ahead to step 5:
1 can be fit into 9 9 times, resulting in a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 51649.0
If we subtract 9 from 9, we get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

On to step 6:
If we divide 1 by 1, we get 1 and a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 516491.0
Subtract 1 from 1 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
The number 1 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 516491.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
1 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 516491.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 516491.0 with a remainder of 0.0.