135821149 has 2 divisors, whose sum is σ = 135821150. Its totient is φ = 135821148.

The previous prime is 135821131. The next prime is 135821183. The reversal of 135821149 is 941128531.

135821149 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (135821183) can be obtained adding 135821149 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76685049 + 59136100 = 8757^2 + 7690^2 .

It is a cyclic number.

It is not a de Polignac number, because 135821149 - 2⁹ = 135820637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (135821249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67910574 + 67910575.

It is an arithmetic number, because the mean of its divisors is an integer number (67910575).

Almost surely, 2^135821149 is an apocalyptic number.

It is an amenable number.

135821149 is a deficient number, since it is larger than the sum of its proper divisors (1).

135821149 is an equidigital number, since it uses as much as digits as its factorization.

135821149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 135821149 is about 11654.2330936017. The cubic root of 135821149 is about 514.0307896892.

The spelling of 135821149 in words is "one hundred thirty-five million, eight hundred twenty-one thousand, one hundred forty-nine".