• 139 can be written using four 4's:
It is a happy number.
139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
139 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.
It is a weak prime.
It is a cyclic number.
It is a Chen prime.
It is a plaindrome in base 7, base 10, base 11, base 14 and base 16.
It is a nialpdrome in base 12, base 13 and base 15.
139 is an equidigital number, since it uses as much as digits as its factorization.
139 is an evil number, because the sum of its binary digits is even.
The square root of 139 is about 11.7898261226. The cubic root of 139 is about 5.1801014674.
The spelling of 139 in words is "one hundred thirty-nine", and thus it is an aban number.