Hex #152d47 or rgb(21,45,71) in RGB space is the tint of blue. It has hue angle of 211.20 degrees, value = 28 and saturation = 70. #152d47 can be obtained by mixing 4 colors: 1 drop of red, 5 drops of blue, 1 drop of green, 5 drops of black.
Nearest safe hex - #003333. Below you can see the block with #152d47 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #152d47 to the mixer and play with it.