Hex #1c91b4 or rgb(28,145,180) in RGB space is the tint of bluish cian. It has hue angle of 193.82 degrees, value = 71 and saturation = 84. #1c91b4 can be obtained by mixing 3 colors: 1 drop of yellow, 5 drops of blue, 3 drops of cyan.
Nearest safe hex - #3399cc. Below you can see the block with #1c91b4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #1c91b4 to the mixer and play with it.