11,111,111

Number
$11 \, 111 \, 111$ (one hundred and eleven thousand, one hundred and eleven) is:


 * $11 \times 73 \times 101 \times 137$


 * The $8$th repuint after $1$, $11$, $111$, $1111$, $11 \, 111$, $111 \, 111$, $1 \, 111 \, 111$


 * A palindromic number whose square is also palindromic:
 * $11 \, 111 \, 111^2 = 123 \, 456 \, 787 \, 654 \, 321$

Also see

 * Square of Small-Digit Palindromic Number is Palindromic