Rate Constant and Activation Energy

The first order rate constant for the decomposition of CaCO3 at 700K is 6.36×10−3s−1 and activation energy is 209‌kJ‌mol−1. Its rate constant (in s−1) at 600K is x×10−6. The value of x is ......... (Nearest integer)
[Given, R=8.31JK−1mol−1,log‌6.36×10−3 =−2.19,10−4.79=1.62×10−5]