1729

Number
$1729$ (one thousand, seven hundred and twenty-nine) is:
 * $7 \times 13 \times 19$


 * The $6$th Poulet number after $341, 561, 645, 1105, 1387$:
 * $2^{1729} \equiv 2 \pmod {1729}$: $1729 = 7 \times 13 \times 19$