83 is the smallest multidigit prime that consists of only curved digits.
83 is the only prime equal to the sum of the squares of the odd prime digits: 83 = 32 + 52 + 72.
83 is the smallest prime number that is the sum of a prime number of consecutive primes in a prime number of different ways: 83 = 23 + 29 + 31 = 11 + 13 + 17 + 19 + 23.
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Bismuth, with atomic number 83, is the heaviest stable element.
Source: Prime Curios!
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