573

Number
$573$ (five hundred and seventy-three) is:


 * $3 \times 191$


 * The $3$rd integer after $91$, $428$ whose square has a decimal representation consisting of the concatenation of $2$ consecutive integers:
 * $573^2 = 328 \, 329$


 * The $2$nd integer after $428$ whose square has a decimal representation consisting of the concatenation of $2$ consecutive increasing integers:
 * $573^2 = 328 \, 329$