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91 (číslo) Matematika | Chemie | Reference | Navigační menurozšíříte

Přirozená čísla


←90919293949596979899→přirozené číslodevadesátdevadesát dvaŘadová číslovkaŘímskými číslicemi












91 (číslo)




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Celé číslo
91

devadesát jedna



Rozklad

7⋅13displaystyle 7cdot 13

Dělitelé
1, 7, 13, 91

Římskými číslicemi
XCI

Dvojkově
10110112

Trojkově
101013

Čtyřkově
11234

Pětkově
3315

Šestkově
2316

Sedmičkově
1607

Osmičkově
1338

Šestnáctkově
5B16

Devadesát jedna je přirozené číslo. Následuje po číslu devadesát a předchází číslu devadesát dva. Řadová číslovka je devadesátý první nebo jednadevadesátý. Římskými číslicemi se zapisuje XCI.



Matematika |


Devadesát jedna je


  • po číslu 55 druhé nejmenší číslo (kromě 1), které je zároveň trojúhelníkové i pyramidové, rovněž jde o šestiúhelníkové číslo.

  • deficientní číslo.

  • bezčtvercové celé číslo

  • nepříznivé číslo.

  • v desítkové soustavě šťastné číslo.


Chemie |


  • 91 je atomové číslo protaktinia, neutronové číslo třetího nejméně běžného přírodního izotopu gadolinia a nukleonové číslo druhého nejméně běžného přírodního izotopu zirkonia.[1]




Reference |



  1. ↑ http://www.nndc.bnl.gov/chart/reCenter.jsp?z=40&n=51




Pahýl


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