Hex #154b56 or rgb(21,75,86) in RGB space is the tint of bluish cian. It has hue angle of 190.15 degrees, value = 34 and saturation = 76. #154b56 can be obtained by mixing 4 colors: 1 drop of magenta, 5 drops of blue, 3 drops of green, 3 drops of black.
Nearest safe hex - #003366. Below you can see the block with #154b56 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #154b56 to the mixer and play with it.