315

Number
$315$ (three hundred and fifteen) is:


 * $3^2 \times 5 \times 7$


 * The $1$st of the $3$rd ordered triple of consecutive integers after $\left({105, 106, 107}\right)$ and $\left({165, 166, 167}\right)$ that have Euler $\phi$ values which are strictly increasing:
 * $\phi \left({315}\right) = 144$, $\phi \left({316}\right) = 156$, $\phi \left({317}\right) = 316$