14 x (1 + 4) = 14 x 5 = 70
1155
1
38
2
Any prime numbers of about 66 or 67 digits will do.
Find a four digit number whose digits will be reversed when multiplied by nine?
The number is 21978. 21978 when multiplied by 4 which gives the result 87912 which is in reverse order.
Six.
No, reversing the order of the digits of a two-digit prime number does not always result in a prime number.
1155
1
A two digit number whose two digits added together equal 42 and multiplied together equal 82
19
It works!
38
2
Any prime numbers of about 66 or 67 digits will do.