111,111,111

Number
$111 \, 111 \, 111$ (one hundred and eleven million, one hundred and eleven thousand, one hundred and eleven) is:


 * $3^2 \times 37 \times 333 \, 667$


 * The $9$th repuint after $1$, $11$, $111$, $1111$, $11 \, 111$, $111 \, 111$, $1 \, 111 \, 111$, $11 \, 111 \, 111$


 * A palindromic number whose square is also palindromic:
 * $111 \, 111 \, 111^2 = 12 \, 345 \, 678 \, 987 \, 654 \, 321$

Also see

 * Square of Small-Digit Palindromic Number is Palindromic