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1 (one, unit, unity) is a number, numeral, and glyph It is the first and smallest positive integer of the infinite sequence of natural numbers. In conway and guy's system, which is the one used here, the unit comes first, then the ten, then the hundred, e.g The glyph used today in the western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the. Although the number 1 used to be considered a prime number, it requires special treatment in so many definitions and applications involving primes greater than or equal to 2. In scientific notation, it is written as 1 × 10 0 It has a total of 0 prime factors and 1 positive divisors There is one positive integer. The superscript one, ¹, is used in mathematics to denote the power of a number or variable. Pronunciation of the number 1 One (1) is the first natural number, followed by two The roman numeral for one is i In mathematics, the number one is the multiplicative identity This is a free online math calculator together with a variety of other free math calculators that compute standard deviation, percentage, fractions, and more. Your guide to the number 1, an odd number which is uniquely neither prime nor composite Mathematical info, prime factorization, fun facts and numerical data for stem, education and.