1111111111
1,111,111,111
999999
102 is the smallest three digit number with different digits.
The smallest prime number in which all of the digits are also prime is 2.The smallest multi-digit prime number in which all of the digits are also prime is 23.
1.111
12345
The smallest 10-digit number with no repeated digits is 1023456789. This number starts with 1, the smallest non-zero digit, followed by the remaining digits in ascending order, ensuring all digits from 0 to 9 are used exactly once without repetition.
111111. Since there are six digits, there must be a repeated digit, so why not repeat all ones to get the smallest one.
111111
13,579 or .13579 . If I'm allowed to repeat digits, then you are 11,111 or .11111 .
123,456 would be the smallest number using all 6 digits. You arrange the numbers from lowest to highest.
The smallest number that when doubled contains all the same digits in a different order.