| Nominal | 13981 |
| Cardinal | thirteen thousand nine hundred eighty-one |
Cardinal thirteen thousand nine hundred eighty-one | |
| Ordinal | 13,981st |
| Number of digits | 5 |
| Sum of digits | 22 |
| Product of digits | 216 |
| Number parity | Odd |
| Prime factorization | 11 x 31 x 41 |
| Prime factors | 11, 31, 41 |
| Number of distinct prime factors ω(n) | 3 |
| Total number of prime factors Ω(n) | 3 |
| Sum of prime factors | 83 |
| Product of prime factors | 13981 |
| Is 13981 a prime number? | No |
| Is 13981 a semiprime number? | No |
| Is 13981 a Chen prime number? | No |
| Is 13981 a Mersenne prime number? | No |
| Is 13981 a Catalan number? | No |
| Is 13981 a Fibonacci number? | No |
| Is 13981 a Idoneal number? | No |
| Square of 13981 (n2) | 195468361 |
| Cube of 13981 (n3) | 2732843155141 |
| Square root of 13981 | 118.24127874816 |
| Natural Logarithm (ln) of 13981 | 9.5454545439878 |
| Decimal Logarithm (log) of 13981 | 4.1455382357122 |
| Sine of 13981 | 0.79115279027885 |
| Cosecant of 13981 | 1.2639783519534 |
| Cosine of 13981 | 0.61161855958922 |
| Secant of 13981 | 1.6350059760639 |
| Tangent of 13981 | 1.2935395400856 |
| Cotangent of 13981 | 0.77307261897371 |
| The spelling of 13981 in words is "thirteen thousand nine hundred eighty-one", meaning that: |
| 13981 is not an aban number (as it contains the letter a) |
| 13981 is not an eban number (as it contains the letter e) |
| 13981 is not an iban number (as it contains the letter i) |
| 13981 is not an oban number (as it contains the letter o) |
| 13981 is not a tban number (as it contains the letter t) |
| 13981 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১৩৯৮১ |
| Eastern Arabic numerals | ١٣٬٩٨١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓆼𓍪𓎍𓏺 |
| Khmer numerals | ១៣៩៨១ |
| Japanese numerals | 一万三千九百八十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๓๙๘๑ |
| Arabic | ثلاثة عشر ألف و تسعة مائة و واحد و ثمانون |
| Croatian | trinaest tisuća devetsto osamdeset i jedan |
| Czech | třináct tisíc devět set osmdesát jeden |
| Danish | tretten tusinde ni hundrede en og firs |
| Dutch | dertienduizend negenhonderdéénentachtig |
| Estonian | akpe wuietɔ̃ alafa asieke blaenyi vɔ ɖekɛ |
| Faroese | trettan tusin og níggjuhundraðogáttatiein |
| Filipino | labíng-tatlóng libó’t siyám na daán at walóng pû’t isá |
| Finnish | kolmetoistatuhattayhdeksänsataakahdeksankymmentäyksi |
| French | treize mille neuf cent quatre-vingt-un |
| Greek | δεκατρεις χίλιάδες εννιακόσια ογδόντα ένα |
| German | dreizehntausendneunhunderteinundachtzig |
| Hebrew | שלושה עשר אלף תשע מאות שמונים ואחת |
| Hindi | तेरह हज़ार नौ सौ इक्यासी |
| Hungarian | tizenháromezerkilencszáznyolcvanegy |
| Icelandic | þrettán þúsund og níuhundrað og áttatíu og einn |
| Indonesian | tiga belas ribu sembilan ratus delapan puluh satu |
| Italian | tredicimilanovecentoottantuno |
| Japanese | 一万三千九百八十一 |
| Korean | 만 삼천구백팔십일 |
| Latvian | trīspadsmit tūkstoši deviņsimt astoņdesmit viens |
| Lithuanian | trylika tūkstančių devyni šimtai aštuoniasdešimt vienas |
| Norwegian | tretten tusen ni hundre og åttién |
| Persian | سیزده هزار و نهصد و هشتاد و یک |
| Polish | trzynaście tysięcy dziewięćset osiemdziesiąt jeden |
| Portuguese | treze mil novecentos e oitenta e um |
| Romanian | treisprezece mii nouă sute optzeci şi unu |
| Russian | тринадцать тысяч девятьсот восемьдесят один |
| Serbian | тринаест хиљада деветсто осамдесет и један |
| Slovak | trinásť tisíc deväťsto osemdesiatjeden |
| Slovene | trinajst tisuću devetsto osemdeset ena |
| Spanish | trece mil novecientos ochenta y uno |
| Swahili | elfu kumi na tatu, mia tisa na themanini na moja |
| Swedish | trettontusenniohundraåttioen |
| Thai | หนึ่งหมื่นสามพันเก้าร้อยแปดสิบเอ็ด |
| Turkish | on üç bin dokuz yüz seksen bir |
| Ukrainian | тринадцять тисяч девʼятсот вісімдесят один |
| Vietnamese | mười ba nghìn chín trăm tám mươi mốt |
| Number 13981 reversed | 18931 | |
| Unicode Character | U+369D | 㚝 |
| Unix Timestamp | Thu, 01 Jan 1970 03:53:01 +0000 | |