+**243** is a [natural number](/wiki/natural_number), notable as the fifth [power](/wiki/power) of three ($3^5$). It is also a [Harshad number](/wiki/Harshad_number), divisible by the sum of its digits (2+4+3=9).
+## See also
+- [Integer](/wiki/integer)
+- [Exponents](/wiki/exponents)
+- [Number theory](/wiki/number_theory)
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