• 1492 = 22201 is the smallest square that contains exactly three digits '2'.
• 149 can be written using four 4's:
149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
149 is an esthetic number in base 14, because in such base its adjacent digits differ by 1.
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-149 is a prime.
It is a Chen prime.
It is a tribonacci number.
It is an alternating number because its digits alternate between odd and even.
It is a plaindrome in base 8, base 10, base 11 and base 15.
It is a nialpdrome in base 4, base 13, base 14 and base 16.
It is a congruent number.
It is a good prime.
It is an amenable number.
149 is an equidigital number, since it uses as much as digits as its factorization.
149 is an evil number, because the sum of its binary digits is even.
The square root of 149 is about 12.2065556157. The cubic root of 149 is about 5.3014591924.
The spelling of 149 in words is "one hundred forty-nine", and thus it is an aban number.