This number is a prime.
1+1+1+1+4+1+1+1+4+1 = 1*1*1*1*4*1*1*1*4*1 = 16. The smallest example of a ten-digit prime with this property. [Bajpai]
1+1+1+1+4+1+1+1+4+1 = 1*1*1*1*4*1*1*1*4*1 = 16. The
smallest example of a ten-digit prime with this property. [Bajpai]