| Nominal | 81081 |
| Cardinal | eighty-one thousand eighty-one |
Cardinal eighty-one thousand eighty-one | |
| Ordinal | 81,081st |
| Number of digits | 5 |
| Sum of digits | 18 |
| Product of digits | 0 |
| Number parity | Odd |
| Prime factorization | 3 x 3 x 3 x 3 x 7 x 11 x 13 |
| Prime factorization in exponent form | 34 x 7 x 11 x 13 |
| Prime factors | 3, 7, 11, 13 |
| Number of distinct prime factors ω(n) | 4 |
| Total number of prime factors Ω(n) | 7 |
| Sum of prime factors | 34 |
| Product of prime factors | 3003 |
| Is 81081 a prime number? | No |
| Is 81081 a semiprime number? | No |
| Is 81081 a Chen prime number? | No |
| Is 81081 a Mersenne prime number? | No |
| Is 81081 a Catalan number? | No |
| Is 81081 a Fibonacci number? | No |
| Is 81081 a Idoneal number? | No |
| Square of 81081 (n2) | 6574128561 |
| Cube of 81081 (n3) | 533036917854441 |
| Square root of 81081 | 284.74725635201 |
| Natural Logarithm (ln) of 81081 | 11.303203933988 |
| Decimal Logarithm (log) of 81081 | 4.908919096358 |
| Sine of 81081 | 0.35675919194302 |
| Cosecant of 81081 | 2.8030111699539 |
| Cosine of 81081 | -0.93419638136966 |
| Secant of 81081 | -1.0704387427982 |
| Tangent of 81081 | -0.3818888609052 |
| Cotangent of 81081 | -2.6185628919097 |
| The spelling of 81081 in words is "eighty-one thousand eighty-one", meaning that: |
| 81081 is not an aban number (as it contains the letter a) |
| 81081 is not an eban number (as it contains the letter e) |
| 81081 is not an iban number (as it contains the letter i) |
| 81081 is not an oban number (as it contains the letter o) |
| 81081 is not a tban number (as it contains the letter t) |
| 81081 is not an uban number (as it contains the letter u) |
| Bengali numerals | ৮১০৮১ |
| Eastern Arabic numerals | ٨١٬٠٨١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓂭𓂭𓂭𓂭𓂭𓂭𓆼𓎍𓏺 |
| Khmer numerals | ៨១០៨១ |
| Japanese numerals | 八万千八十一 |
| Roman numerals | n/a |
| Thai numerals | ๘๑๐๘๑ |
| Arabic | واحد و ثمانون ألف و واحد و ثمانون |
| Croatian | osamdeset i jedna tisuća osamdeset i jedan |
| Czech | osmdesát jedna tisíc osmdesát jeden |
| Danish | en og firs tusinde og en og firs |
| Dutch | éénentachtigduizend éénentachtig |
| Estonian | akpe blaenyi vɔ ɖekɛ kple blaenyi vɔ ɖekɛ |
| Faroese | áttatieitt tusin og áttatiein |
| Filipino | walóng pû’t isáng libó’t walóng pû’t isá |
| Finnish | kahdeksankymmentäyksituhattakahdeksankymmentäyksi |
| French | quatre-vingt-un mille quatre-vingt-un |
| Greek | ογδόντα μία χίλιάδες ογδόντα ένα |
| German | einundachtzigtausendeinundachtzig |
| Hebrew | שמונים ואחד אלף שמונים ואחת |
| Hindi | इक्यासी हज़ार इक्यासी |
| Hungarian | nyolcvanegyezernyolcvanegy |
| Icelandic | áttatíu og eitt þúsund og áttatíu og einn |
| Indonesian | delapan puluh satu ribu delapan puluh satu |
| Italian | ottant e unmilaottantuno |
| Japanese | 八万千八十一 |
| Korean | 팔만 천팔십일 |
| Latvian | astoņdesmit viens tūkstoši astoņdesmit viens |
| Lithuanian | aštuoniasdešimt vienas tūkstantis aštuoniasdešimt vienas |
| Norwegian | åttiett tusen og åttién |
| Persian | هشتاد و یک هزار و هشتاد و یک |
| Polish | osiemdziesiąt jeden tysięcy osiemdziesiąt jeden |
| Portuguese | oitenta e um mil e oitenta e um |
| Romanian | optzeci şi una mii optzeci şi unu |
| Russian | восемьдесят одна тысяча восемьдесят один |
| Serbian | осамдесет и једна хиљада осамдесет и један |
| Slovak | osemdesiatjedna tisíc osemdesiatjeden |
| Slovene | osemdeset ena tisuću osemdeset ena |
| Spanish | ochenta y un mil ochenta y uno |
| Swahili | elfu themanini na moja, themanini na moja |
| Swedish | åttioentusenåttioen |
| Thai | แปดหมื่นหนึ่งพันแปดสิบเอ็ด |
| Turkish | seksen bir bin seksen bir |
| Ukrainian | вісімдесят одна тисяча вісімдесят один |
| Vietnamese | tám mươi mốt nghìn không trăm tám mươi mốt |
| Number 81081 reversed | 18018 | |
| Unicode Character | U+13CB9 | |
| Unix Timestamp | Thu, 01 Jan 1970 22:31:21 +0000 | |