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| Cardinal | two hundred seventeen | |||
| Ordinal | 217th (two hundred seventeenth) | |||
| Factorization | 7 × 31 | |||
| Greek numeral | ΣΙΖ´ | |||
| Roman numeral | CCXVII,ccxvii | |||
| Binary | 110110012 | |||
| Ternary | 220013 | |||
| Senary | 10016 | |||
| Octal | 3318 | |||
| Duodecimal | 16112 | |||
| Hexadecimal | D916 | |||
217 (two hundred [and] seventeen) is thenatural number following216 and preceding218.
217 is acentered hexagonal number, a12-gonal number, acentered 36-gonal number, aFermat pseudoprime tobase 5, and aBlum 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-repetitiveKaprekar number.[2] It is also the sum of all thedivisors of100 and the number of week-month combinations in the Gregorian calendar (Monday the 1st, Tuesday the 2nd, Wednesday the 3rd, etc).
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