121128149 has 2 divisors, whose sum is σ = 121128150. Its totient is φ = 121128148.

The previous prime is 121128131. The next prime is 121128181. The reversal of 121128149 is 941821121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69388900 + 51739249 = 8330^2 + 7193^2 .

It is an emirp because it is prime and its reverse (941821121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121128149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121128109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60564074 + 60564075.

It is an arithmetic number, because the mean of its divisors is an integer number (60564075).

Almost surely, 2^121128149 is an apocalyptic number.

It is an amenable number.

121128149 is a deficient number, since it is larger than the sum of its proper divisors (1).

121128149 is an equidigital number, since it uses as much as digits as its factorization.

121128149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 29.

The square root of 121128149 is about 11005.8234130845. The cubic root of 121128149 is about 494.7832932311.

The spelling of 121128149 in words is "one hundred twenty-one million, one hundred twenty-eight thousand, one hundred forty-nine".