19

This number is a prime.

Single Curio View: (Seek other curios for this number)

It is a 4-digit number: The tens are double the ones, the thousands are double the tens, and the sum of the digits is 19. What is the unknown number? [Booj]

Submitted: 2015-02-11 00:10:19; Last Modified: 2020-02-02 02:00:10.