Hex #1781a3 or rgb(23,129,163) in RGB space is the tint of bluish cian. It has hue angle of 194.57 degrees, value = 64 and saturation = 86. #1781a3 can be obtained by mixing 4 colors: 3 drops of blue, 4 drops of cyan, 1 drop of white, 3 drops of black.
Nearest safe hex - #009999. Below you can see the block with #1781a3 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #1781a3 to the mixer and play with it.