• 149^{2} = 22201 is the smallest square that contains exactly three digits '2'.

• 149 can be written using four 4's:

149 has 2 divisors, whose sum is σ = 150. Its totient is φ = 148.

The previous prime is 139. The next prime is 151. The reversal of 149 is 941.

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 can be written as a sum of positive squares in only one way, i.e., 100 + 49 = 10^2 + 7^2 .

It is an emirp because it is prime and its reverse (941) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^{k}-149 is a prime.

Together with 151, it forms a pair of twin primes.

It is a Chen prime.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 1 and 49 contains 149 itself.

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 a polite number, since it can be written as a sum of consecutive naturals, namely, 74 + 75.

It is an arithmetic number, because the mean of its divisors is an integer number (75).

It is an amenable number.

149 is a deficient number, since it is larger than the sum of its proper divisors (1).

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 product of its digits is 36, while the sum is 14.

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.

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