| Nominal | 16381 |
| Cardinal | sixteen thousand three hundred eighty-one |
Cardinal sixteen thousand three hundred eighty-one | |
| Ordinal | 16,381st |
| Number of digits | 5 |
| Sum of digits | 19 |
| Product of digits | 144 |
| Number parity | Odd |
| Prime factorization | 16381 |
| Prime factors | 16381 |
| Number of distinct prime factors ω(n) | 1 |
| Total number of prime factors Ω(n) | 1 |
| Sum of prime factors | 16381 |
| Product of prime factors | 16381 |
| Is 16381 a prime number? | Yes |
| Is 16381 a semiprime number? | No |
| Is 16381 a Chen prime number? | No |
| Is 16381 a Mersenne prime number? | No |
| Is 16381 a Catalan number? | No |
| Is 16381 a Fibonacci number? | No |
| Is 16381 a Idoneal number? | No |
| Square of 16381 (n2) | 268337161 |
| Cube of 16381 (n3) | 4395631034341 |
| Square root of 16381 | 127.98828071351 |
| Natural Logarithm (ln) of 16381 | 9.7038774056046 |
| Decimal Logarithm (log) of 16381 | 4.2143404103197 |
| Sine of 16381 | 0.67125763204954 |
| Cosecant of 16381 | 1.4897409761237 |
| Cosine of 16381 | 0.74122411686024 |
| Secant of 16381 | 1.34911962152 |
| Tangent of 16381 | 0.90560684249311 |
| Cotangent of 16381 | 1.1042319393778 |
| The spelling of 16381 in words is "sixteen thousand three hundred eighty-one", meaning that: |
| 16381 is not an aban number (as it contains the letter a) |
| 16381 is not an eban number (as it contains the letter e) |
| 16381 is not an iban number (as it contains the letter i) |
| 16381 is not an oban number (as it contains the letter o) |
| 16381 is not a tban number (as it contains the letter t) |
| 16381 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১৬৩৮১ |
| Eastern Arabic numerals | ١٦٬٣٨١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓆼𓆼𓆼𓆼𓍤𓎍𓏺 |
| Khmer numerals | ១៦៣៨១ |
| Japanese numerals | 一万六千三百八十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๖๓๘๑ |
| Arabic | ستة عشر ألف و ثلاثة مائة و واحد و ثمانون |
| Croatian | šesnaest tisuća tristo osamdeset i jedan |
| Czech | šestnáct tisíc tři sta osmdesát jeden |
| Danish | seksten tusinde tre hundrede en og firs |
| Dutch | zestienduizend driehonderdéénentachtig |
| Estonian | akpe wuiade alafa etɔ̃ blaenyi vɔ ɖekɛ |
| Faroese | sekstan tusin og trýhundraðogáttatiein |
| Filipino | labíng-anim na libó’t tatlóng daán at walóng pû’t isá |
| Finnish | kuusitoistatuhattakolmesataakahdeksankymmentäyksi |
| French | seize mille trois cent quatre-vingt-un |
| Greek | δεκαέξι χίλιάδες τριακόσια ογδόντα ένα |
| German | sechzehntausenddreihunderteinundachtzig |
| Hebrew | שישה עשר אלף שלוש מאות שמונים ואחת |
| Hindi | सोलह हज़ार तीन सौ इक्यासी |
| Hungarian | tizenhatezerháromszáznyolcvanegy |
| Icelandic | sextán þúsund og þrjúhundrað og áttatíu og einn |
| Indonesian | enam belas ribu tiga ratus delapan puluh satu |
| Italian | sedicimilatrecentoottantuno |
| Japanese | 一万六千三百八十一 |
| Korean | 만 육천삼백팔십일 |
| Latvian | sešpadsmit tūkstoši trīssimt astoņdesmit viens |
| Lithuanian | šešiolika tūkstančių trys šimtai aštuoniasdešimt vienas |
| Norwegian | seksten tusen tre hundre og åttién |
| Persian | شانزده هزار و سیصد و هشتاد و یک |
| Polish | szesnaście tysięcy trzysta osiemdziesiąt jeden |
| Portuguese | dezesseis mil trezentos e oitenta e um |
| Romanian | şasesprezece mii trei sute optzeci şi unu |
| Russian | шестнадцать тысяч триста восемьдесят один |
| Serbian | шеснаест хиљада триста осамдесет и један |
| Slovak | šestnásť tisíc tristo osemdesiatjeden |
| Slovene | šestnajst tisuću tristo osemdeset ena |
| Spanish | dieciseis mil trescientos ochenta y uno |
| Swahili | elfu kumi na sita, mia tatu na themanini na moja |
| Swedish | sextontusentrehundraåttioen |
| Thai | หนึ่งหมื่นหกพันสามร้อยแปดสิบเอ็ด |
| Turkish | on altı bin üç yüz seksen bir |
| Ukrainian | шістнадцять тисяч триста вісімдесят один |
| Vietnamese | mười sáu nghìn ba trăm tám mươi mốt |
| Number 16381 reversed | 18361 | |
| Unicode Character | U+3FFD | 㿽 |
| Unix Timestamp | Thu, 01 Jan 1970 04:33:01 +0000 | |