Yes, the number zero. Currently, the natural numbers are normally taken to start with zero, not with one (this was not always so). The number zero has no predecessor in the set of natural numbers. In the set of integers, however, every number has a predecessor and a successor.
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Least or smallest natural number is 1.
A natural number is doubled when added to its reciprocal. Find that number!
9
It is 9999998.
A prime number has only two factors which are itself and one whereas a composite number has more than two factors. Note that 1 is neither a prime or a composite number.