Is there a mathematical term for reversing the digits of a number?

It is called "reversing the digits of the number".

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For a 2-digit number, the difference in value is 9 times the difference between the digits: 31 - 13 = 9*(3 - 1)

If any number 'x' is of 'n' digits

i.e. Number 'x' = n digits

Then reverse of number 'x' is as given in below picture

Functions used: floor function, mod function, summation function

Yes. The general term for changing the order is a permutation. The specific case is a palindrome.

Yes. It's a fancy one: "Reversing the digits of a number."

(keep it secret, okay?)

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> John (gnujohn)