Briefly

A 9 digit cousin

A 9 digit cousin

Sorting in some way all digits 1 through 9, Are you able to build a 9-figure prime number?

Solution

It is impossible since any number formed by the nine digits from 1 to 9 is a multiple of 9, since the sum of those nine digits is 45, a multiple of 3 and 9 and therefore divisible between 3 and 9.