319

Number
$319$ (three hundred and nineteen) is:


 * $11 \times 29$


 * The $49$th happy number after $1, 7, 10, 13, 19, 23, \ldots, 226, 230, 236, 239, 262, 263, 280, 291, 293, 301, 302, 310, 313$:
 * $319 \to 3^2 + 1^2 + 9^2 = 9 + 1 + 81 = 91 \to 9^2 + 1^2 = 81 + 1 = 82 \to 8^2 + 2^2 = 64 + 4 = 68 \to 6^2 + 8^2 = 36 + 64 = 100 \to 1^2 + 0^2 + 0^2 = 1$


 * The $4$th positive integer after $79$, $159$, $239$ which cannot be expressed as the sum of fewer than $19$ fourth powers:
 * $319 = 15 \times 1^4 + 3 \times 2^4 + 4^4$
 * or:
 * $319 = 12 \times 1^4 + 4 \times 2^4 + 3 \times 3^4$