Hex #554e9d or rgb(85,78,157) in RGB space is the tint of violet. It has hue angle of 245.32 degrees, value = 62 and saturation = 50. #554e9d can be obtained by mixing 4 colors: 1 drop of magenta, 3 drops of blue, 1 drop of white, 1 drop of black.
Nearest safe hex - #666699. Below you can see the block with #554e9d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #554e9d to the mixer and play with it.