This star has a mass of about 13–14 times the mass of the Sun with 8–11 times the Sun's radius. The effective temperature of the star's outer envelope is about 23,150 K, which is much higher than the Sun's at 5,778 K. The energy emitted at the high temperature of the former is what gives this star a blue-white hue characteristic of a B-type star. The estimated age of Mirzam is , which is long enough for a star of this mass to have evolved into a giant star. The stellar classification of B1 II-III indicates that the spectrum matches a star part way between a giant star and a bright giant.