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243 (two hundred [and] forty-three) is the natural number following 242 and preceding 244.

Additionally, 243 is:

• the only 3-digit number that is a fifth power (3⁵).
• a perfect totient number. ^[1]
• the sum of five consecutive prime numbers (41 + 43 + 47 + 53 + 59).
• an 82- gonal number.

References

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