An exotic starship engine uses a fuel with a specific impulse of $4500 \text{ s}$. The force (thrust) is given by $F = \dot{m} \cdot I_{sp} \cdot g_0$, where $\dot{m}$ is mass flow rate, $I_{sp}$ is specific impulse, and $g_0 = 9.80665 \text{ m/s}^2$. If the engine must produce $2.5 \text{ MN}$ of thrust, what is the mass flow rate in $\text{kg/min}$?