Well, isn't that a happy little question! To find the mean, you add up all the numbers and then divide by how many numbers there are. In this case, with just one number, 31, the mean is simply 31. Keep up the good work, my friend!
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Oh, dude, the mean of 31 is just 31 itself. No need to round it to 1 decimal place when you only have one number in the set. It's like asking a single player to form a team - not much of a game, right?
There is no sensible meaning to "31 round to 1 dp" because the number is already rounded to a greater degree than that!