To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
.
Leo
Newton
Brights
Milds

139 (number)

 ← 138 139 140 →
Cardinalone hundred thirty-nine
Ordinal139th
(one hundred thirty-ninth)
Factorizationprime
Prime34th
Divisors1, 139
Greek numeralΡΛΘ´
Roman numeralCXXXIX
Binary100010112
Ternary120113
Quaternary20234
Quinary10245
Senary3516
Octal2138
DuodecimalB712
Vigesimal6J20
Base 363V36

139 (One hundred [and] thirty-nine) is the natural number following 138 and preceding 140.

In mathematics

139 is the 34th prime number. It is a twin prime with 137. Because 141 is a semiprime, 139 is a Chen prime. 139 is the smallest prime before a prime gap of length 10.[1]

This number is the sum of five consecutive prime numbers (19 + 23 + 29 + 31 + 37).

It is the smallest factor of 64079. It is also the smallest factor of the first nine terms of the Euclid–Mullin sequence, making it the tenth term.

139 is a happy number[2] and a strictly non-palindromic number.[3]

139 is also: