11,689

Number
$11 \, 689$ (eleven thousand, six hundred and eighty-nine) is:


 * The $1403$rd prime number


 * The $9$th and last after $11 \, 593$, $11 \, 597$, $11 \, 617$, $11 \, 621$, $11 \, 633$, $11 \, 657$, $11 \, 677$, $11 \, 681$ of a sequence of consecutive prime numbers all of the form $4 n + 1$:
 * $11 \, 689 = 4 \times 2922 + 1$

Also see