okay bitch i guessed and put it in a prime number checker and removed 5s until i got it right
my real guess is 97231713
motherfu
You can use the cross sum to check that. If the sum of all the digits is divisible by 3 then the number will also be divisible by 3. I at least remember that.
301,971,937 maybe? That's just an educated guess, I have nothing to back it up, and have no plan to actually check.