It is 1, as it is for all complex numbers - which includes real numbers.
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One.
The multiplicative identity of a number leaves that number unchanged under multiplication. Thus the multiplicative identity of any number is 1.
Rational numbers and Real Numbers. The multiplicative inverses of integers are not integers.
It isa natural numberan integera rational numbera real numbera complex numberIt is also the multiplicative identity of each of the above sets of numbers.
Additive identity: zero. Multiplicative identity: one.