217 (number)

This article is about the numerical value. For other uses, see 217 (disambiguation).
← 216 217 218 →
Cardinaltwo hundred seventeen
Ordinal217th
(two hundred seventeenth)
Factorization7 × 31
Greek numeralΣΙΖ´
Roman numeralCCXVII, ccxvii
Binary110110012
Ternary220013
Senary10016
Octal3318
Duodecimal16112
HexadecimalD916

217 (two hundred [and] seventeen) is the natural number following 216 and preceding 218.

In mathematics

217 is a centered hexagonal number, a 12-gonal number, a centered 36-gonal number, a Fermat pseudoprime to base 5, and a Blum integer.[1] It is both the sum of two positive cubes and the difference of two positive consecutive cubes in exactly one way: . When written in binary, it is a non-repetitive Kaprekar number.[2] It is also the sum of all the divisors of 100.

See also

References

  1. ^ The Number 217, Virtue Science
  2. ^ The non-repetitive Kaprekar binary numbers in decimal, OEIS


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