Hex #156d87 or rgb(21,109,135) in RGB space is the tint of bluish cian. It has hue angle of 193.68 degrees, value = 53 and saturation = 84. #156d87 can be obtained by mixing 4 colors: 1 drop of yellow, 5 drops of blue, 3 drops of cyan, 3 drops of black.
Nearest safe hex - #006699. Below you can see the block with #156d87 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #156d87 to the mixer and play with it.