Needing to see a solution to de is congruent to 1 mod phi of pq. pq needs to be > 9875040
Have you tried doing this yourself? There is some time involved, but the procedure itself is not too difficult, probably the hardest parts are finding a modular inverse (when solving $\displaystyle de\equiv1\ \text{(mod }\varphi(pq)\text{)}$), and then modular exponentiation for encrypting and decrypting. Please show some work and let us know where you are getting stuck, also please tell us whether you're allowed to use a computer algebra system (CAS) like PARI/GP or Mathematica, or if you need to do everything by hand, or with a pocket calculator, etc.