111,111

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


 * $3 \times 7 \times 11 \times 13 \times 37$


 * The $6$th repuint after $1$, $11$, $111$, $1111$, $11 \, 111$


 * The $10$th palindromic integer after $0$, $1$, $2$, $3$, $11$, $77$, $363$, $1111$, $2662$ which is the index of a palindromic triangular number
 * $T_{111 \, 111} = 6 \, 172 \, 882 \, 716$


 * The $26$th palindromic integer after $0$, $1$, $2$, $3$, $11$, $22$, $101$, $\ldots$, $10 \, 201$, $11 \, 011$, $11 \, 111$, $11 \, 211$, $20 \, 002$, $20 \, 102$, $100 \, 001$, $101 \, 101$, $110 \, 011$ whose square is also palindromic integer
 * $111 \, 111^2 = 12 \, 345 \, 654 \, 321$