1,111,111

Number
$1 \, 111 \, 111$ (one million, one hundred and eleven thousand, one hundred and eleven) is:


 * $239 \times 4649$


 * The $7$th repuint after $1$, $11$, $111$, $1111$, $11 \, 111$, $111 \, 111$


 * A palindromic number whose square is also palindromic:
 * $1 \, 111 \, 111^2 = 1 \, 234 \, 567 \, 654 \, 321$

Also see

 * Square of Small-Digit Palindromic Number is Palindromic