105 waa tiro dabiici ah (natural number) oo ku xigta 104 kuna horreysa 106. Waa tiro kis ah (odd), taas oo micnaheedu yahay in aan laba loo qaybin karin. Waxay kaloo tahay tiro isku-dhis ah (composite), maadaama ay leedahay qaybiyayaal ka badan 1 iyo naftiyada.

Qoraalka Roomaanka waxay ku qornaa CV. Nidaamka laba-saldhig (binary) waxay tahay 1101001, halka nidaamka lix-iyo-tobanka (hexadecimal) ay tahay 69.

Sifooyinka xisaabeed

Qaybinta tirooyinka fac-weynta (prime factorization) ee 105 waa 3 × 5 × 7. Sidaas awgeed waa tiro sphenic ah — taas oo ah tiro ka dhalatay isku-dhufashada saddex tiro fac-weyn oo kala duwan. Qaybiyayaasheedu waa 1, 3, 5, 7, 15, 21, 35 iyo 105, oo dhan siddeed qaybiye.

Isugeynta qaybiyayaasha ka yar tirada laftiisa (1+3+5+7+15+21+35) waxay dhalisaa 87, oo ka yar 105. Taasi waxay ka dhigaysaa tiro-yaraad (deficient number).

Tiro saddex-xagal ah

105 waa tiro saddex-xagal ah (triangular number): waa isugeynta tirooyinka 1 ilaa 14 (1+2+3+…+14 = 105). Waxay sidoo kale la mid tahay 7!! (double factorial ee 7), oo ah 7 × 5 × 3 × 1.

Isticmaal kale

105 waxaa loo isticmaalaa tirsi caadi ah oo sannado, lambaro wadooyin, iyo cabbiro kala duwan. Isticmaalladaas gaarka ah waxay ku xiran yihiin nidaamka dalka ama hay'adda wax tirisa, mana laha macne xisaabeed gaar ah.

Hubanti la'aanIsticmaallada gaarka ah ee lambarka 105 (tusaale ahaan wadooyin ama telefoonno degdeg ah) way kala duwan yihiin dal ilaa dal; halkan looma xaqiijin mid gaar ah.

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