1111

Number
$1111$ (one thousand one hundred and eleven) is:


 * $11 \times 101$


 * The $4$th repuint after $1$, $11$, $111$


 * The $51$st Smith number after $4$, $22$, $27$, $58$, $\ldots$, $778$, $825$, $852$, $895$, $913$, $915$, $922$, $958$, $985$, $1086$:
 * $1 + 1 + 1 + 1 = 1 + 1 + 1 + 0 + 1 = 4$


 * A palindromic number whose square is also palindromic:

Also see

 * Square of Small-Digit Palindromic Number is Palindromic