Number 991
Number 991 spell 🔊, write in words: nine hundred and ninetyone . Ordinal number 991th is said 🔊 and write: nine hundred and ninetyfirst. The meaning of number 991 in Maths: Is Prime? Factorization and dividers. The square root and cube root of 991. The meaning in computer science, numerology, codes and images, writing and naming in other languages, other interesting facts.
Useful information about number 991
The number 991 converted to a Mayan number is  
Decimal and Mayan number conversions. 
Weight conversion
991 kilograms (kg) = 2184.8 pounds (lb)
991 pounds (lb) = 449.5 kilograms (kg)
Length conversion
991 kilometers (km) equals to 615.779 miles (mi).
991 miles (mi) equals to 1595 kilometers (km).
991 meters (m) equals to 3252 feet (ft).
991 feet (ft) equals 302.060 meters (m).
991 centimeters (cm) equals to 390.2 inches (in).
991 inches (in) equals to 2517.1 centimeters (cm).
Temperature conversion
991° Fahrenheit (°F) equals to 532.8° Celsius (°C)
991° Celsius (°C) equals to 1815.8° Fahrenheit (°F)
Power conversion
991 Horsepower (hp) equals to 728.78 kilowatts (kW)
991 kilowatts (kW) equals to 1347.57 horsepower (hp)
Time conversion
(hours, minutes, seconds, days, weeks)991 seconds equals to 16 minutes, 31 seconds
991 minutes equals to 16 hours, 31 minutes
Codes and images of the number 991
Number 991 morse code: . . .Sign language for number 991:
Images of the number  
Image (1) of the number  Image (2) of the number 
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Number 991 infographic.

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Gregorian, Hebrew, Islamic, Persian and Buddhist year (calendar)
Gregorian year 991 is Buddhist year 1534.Buddhist year 991 is Gregorian year 448 .
Gregorian year 991 is Islamic year 380 or 381.
Islamic year 991 is Gregorian year 1583 or 1584.
Gregorian year 991 is Persian year 369 or 370.
Persian year 991 is Gregorian 1612 or 1613.
Gregorian year 991 is Hebrew year 4751 or 4752.
Hebrew year 991 is Gregorian year 2769 a. C.
More about the year 991.
The Buddhist calendar is used in Sri Lanka, Cambodia, Laos, Thailand, and Burma. The Persian calendar is official in Iran and Afghanistan.
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Mathematics of no. 991
Multiplications
Multiplication table of 991
991 multiplied by two equals 1982 (991 x 2 = 1982).
991 multiplied by three equals 2973 (991 x 3 = 2973).
991 multiplied by four equals 3964 (991 x 4 = 3964).
991 multiplied by five equals 4955 (991 x 5 = 4955).
991 multiplied by seven equals 6937 (991 x 7 = 6937).
991 multiplied by eight equals 7928 (991 x 8 = 7928).
991 multiplied by nine equals 8919 (991 x 9 = 8919).
Fractions: decimal fraction and common fraction
Fraction table of 991
Half of 991 is 495,5 (991 / 2 = 495,5 = 495 1/2).
One third of 991 is 330,3333 (991 / 3 = 330,3333 = 330 1/3).
One quarter of 991 is 247,75 (991 / 4 = 247,75 = 247 3/4).
One fifth of 991 is 198,2 (991 / 5 = 198,2 = 198 1/5).
One seventh of 991 is 141,5714 (991 / 7 = 141,5714 = 141 4/7).
One eighth of 991 is 123,875 (991 / 8 = 123,875 = 123 7/8).
One ninth of 991 is 110,1111 (991 / 9 = 110,1111 = 110 1/9).
Calculator
991  
Advanced math operations
Is Prime?
The number 991 is a prime number. The closest prime numbers are 983, 997.
991th prime number in order is 7841.
Factorization and dividers
Factorization 991 = 991
Divisors of number 991 are 1 , 991
Total Divisors 2.
Sum of Divisors 992.
Powers
The second power of 991^{2} is 982.081.
The third power of 991^{3} is 973.242.271.
Roots
The square root √991 is 31,480152.
The cube root of ^{3}√991 is 9,96991.
Logarithms
The natural logarithm of No. ln 991 = log_{e} 991 = 6,898715.
The logarithm to base 10 of No. log_{10} 991 = 2,996074.
The Napierian logarithm of No. log_{1/e} 991 = 6,898715.
Trigonometric functions
The cosine of 991 is 0,171628.The sine of 991 is 0,985162.
The tangent of 991 is 5,740091.
Properties of the number 991
Is a Friedman number: NoIs a Fibonacci number: No
Is a Bell number: No
Is a palindromic number: No
Is a pentagonal number: No
Is a perfect number: No
Number 991 in Computer Science
Code type  Code value 

Port 991/TCP, UDP  NAS (Netnews Admin System) 
Unix time  Unix time 991 is equal to Thursday Jan. 1, 1970, 12:16:31 a.m. GMT 
IPv4, IPv6  Number 991 internet address in dotted format v4 0.0.3.223, v6 ::3df 
991 Decimal  = 1111011111 Binary 
991 Decimal  = 1100201 Ternary 
991 Decimal  = 1737 Octal 
991 Decimal  = 3DF Hexadecimal (0x3df hex) 
991 BASE64  OTkx 
991 MD5  692f93be8c7a41525c0baf2076aecfb4 
991 SHA1  e9c535583dbe9b33c317f674d1942accca79f1b3 
991 SHA224  b764665aad1ed21ceac6b32b5357d6128a7018bfc52dbc6f7dc2faf5 
991 SHA256  25b7c81e770034aeda70db74af0fb638beca992d2a535641e6313f38b9665016 
991 SHA384  2c7109ba347a729ed11bda9e3d1cbe35ad765d4a5a647ff3c49c0d068b176cd3d970d671f8d96b3b3c2dec908fd19109 
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Numerology 991
The meaning of the number 9 (nine), numerology 9
Character frequency 9: 2
The meaning of the number 1 (one), numerology 1
Character frequency 1: 1
Interesting facts about the number 991
Asteroids
 (991) McDonalda is asteroid number 991. It was discovered by O. Struve from Yerkes Observatory, Williams Bay on 10/24/1922.
Distances between cities
 There is a 991 miles (1,594 km) direct distance between Abū Ghurayb (Iraq) and İstanbul (Turkey).
 There is a 616 miles (991 km) direct distance between Ankara (Turkey) and Yerevan (Armenia).
 There is a 616 miles (991 km) direct distance between Aurangabad (India) and Varanasi (India).
 There is a 616 miles (991 km) direct distance between Baoding (China) and Changchun (China).
 There is a 616 miles (991 km) direct distance between Baoding (China) and Incheon (South Korea).
 There is a 991 miles (1,594 km) direct distance between Busan (South Korea) and Tainan (Taiwan).
 There is a 991 miles (1,594 km) direct distance between Dubai (United Arab Emirates) and Sanaa (Yemen).
 There is a 991 miles (1,594 km) direct distance between Jinan (China) and Shenzhen (China).
 There is a 616 miles (991 km) direct distance between Ludhiāna (India) and Vadodara (India).
 There is a 616 miles (991 km) direct distance between Pune (India) and Visakhapatnam (India).
 There is a 616 miles (991 km) direct distance between Shivaji Nagar (India) and Visakhapatnam (India).
 There is a 616 miles (991 km) direct distance between Taipei (Taiwan) and Yunfu (China).
 There is a 991 miles (1,594 km) direct distance between Yangon (Burma / Myanmar) and Zhongshan (China).
Mathematics
 991 is a permutable prime.
Please write us
If you know something interesting about the number 991 or any natural number (positive integer), please write to us.Number 991 in other languages
Spanish:  🔊 (número 991)  novecientos noventa y uno 
German:  🔊 (Anzahl 991)  neunhunderteinundneunzig 
French:  🔊 (nombre 991)  neuf cent quatrevingtonze 
Portuguese:  🔊 (número 991)  novecentos e noventa e um 
Chinese:  🔊 (数 991)  九百九十一 
Arabian:  🔊 (عدد 991)  تسعمائةواحد و تسعون 
Czech:  🔊 (číslo 991)  devětset devadesát jedna 
Korean:  🔊 (번호 991)  구백구십일 
Danish:  🔊 (nummer 991)  nihundrede og enoghalvfems 
Hebrew:  (מספר 991)  תשע מאות תשעים ואחד 
Dutch:  🔊 (nummer 991)  negenhonderdeenennegentig 
Japanese:  🔊 (数 991)  九百九十一 
Indonesian:  🔊 (jumlah 991)  sembilan ratus sembilan puluh satu 
Italian:  🔊 (numero 991)  novecentonovantuno 
Norwegian:  🔊 (nummer 991)  ni hundre og nittien 
Polish:  🔊 (liczba 991)  dziewięćset dziewięćdzisiąt jeden 
Russian:  🔊 (номер 991)  девятьсот девяносто один 
Turkish:  🔊 (numara 991)  dokuzyüzdoksanbir 
Thai:  🔊 (จำนวน 991)  เก้าร้อยเก้าสิบเอ็ด 
Ukrainian:  🔊 (номер 991)  дев'ятсот дев'яносто одна 
Vietnamese:  🔊 (con số 991)  chín trăm chín mươi mốt 
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