Hex #156987 or rgb(21,105,135) in RGB space is the tint of bluish cian. It has hue angle of 195.79 degrees, value = 53 and saturation = 84. #156987 can be obtained by mixing 4 colors: 1 drop of magenta, 1 drop of blue, 5 drops of cyan, 5 drops of black.
Nearest safe hex - #006699. Below you can see the block with #156987 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #156987 to the mixer and play with it.