Meaning of prefix length with ip addr add noprefixroute

When assigning an ip address to a network interface with ip addr add noprefixroute, what effect will the specified prefix length have? When noprefixroute is not used, the prefix length is used to automatically create and delete a route for the network prefix of the added address. Does it have any function other than that? For example, what is the difference between

ip addr add noprefixroute 10.137.0.36/16 dev eth0

and

ip addr add noprefixroute 10.137.0.36/32 dev eth0

?