97.77° - axial tilt (slightly retrograde, and roughly 90° away from typical for solar system planets).
Among the solar system planets,
it is easily most similar to Neptune,
which has a slightly smaller radius and a slightly larger mass.
Uranus's 29 known moons include
Miranda, Ariel, Umbriel, Titania and Oberon.
It has a ring system, and within the solar system,
only Saturn's is more extensive and was discovered earlier.
Reaching Uranus by spacecraft is a challenge
(suitable launch windows are very infrequent)
and the only mission to fly near it was Voyager 2 in 1986.
A concept for a future (2030s) mission is the Uranus Orbiter and Probe.