IntegerString

IntegerString[n] gives a string consisting of the decimal digits in integer n.

IntegerString[n, b] gives a string in base b.

IntegerString[n, b, len] pads with zeros to length len.

Examples

Decimal string:

IntegerString[255]
(* "255" *)

Hexadecimal string:

IntegerString[255, 16]
(* "ff" *)

Please visit the official Wolfram Language Reference for more details.