If a natural number is added, subtracted, and divided with itself, the sum, difference, and quotient are added again, and the result is 1991, then the original natural number is 1991______ ．

Let this natural number be x, (x + x) + (x-x) + (x △ x) = 1991, 2x + 1 = 1991, 2x = 1990, x = 995; answer: this natural number is 995; so the answer is: 995

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