Reverse Number
Reverse the digits of any integer instantly.
Recommended Books on Mathematics
Concrete Mathematics
Ronald L. Graham
Elementary Number Theory
David M. Burton
The Joy of x
Steven Strogatz
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How to Use
Enter a Number
Type any integer into the input field.
View the Result
The reversed number is calculated and displayed instantly.
Copy or Use
Use the reversed number for further calculations.
Use Cases
Palindrome Check
"Compare a number with its reverse to check if it's a palindrome."
Math Puzzles
"Solve puzzles that involve reversing numbers."
Programming Practice
"Verify your reverse-integer algorithm output."
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Frequently Asked Questions
?How does reversing a number work?
The digits are read from right to left. For example, 12345 becomes 54321.
?What happens with trailing zeros?
Trailing zeros in the original number become leading zeros when reversed, which are dropped. So 1200 reverses to 21.
?Does it work with negative numbers?
Yes. The negative sign is preserved and only the digits are reversed. So -123 becomes -321.
?Is there a size limit?
The tool handles numbers of any reasonable length using string manipulation.
?What are reversed numbers used for?
They're used in palindrome checks, math puzzles, number theory, and programming challenges.
?Is my data private?
Yes. Everything runs locally in your browser. No data is sent to any server.
?Is this tool free?
Yes. Completely free with no limits, no sign-up required.