Hex #156180 or rgb(21,97,128) in RGB space is the tint of bluish cian. It has hue angle of 197.38 degrees, value = 50 and saturation = 84. #156180 can be obtained by mixing 4 colors: 1 drop of red, 3 drops of blue, 4 drops of cyan, 4 drops of black.
Nearest safe hex - #006699. Below you can see the block with #156180 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #156180 to the mixer and play with it.