188121149 has 2 divisors, whose sum is σ = 188121150. Its totient is φ = 188121148.

The previous prime is 188121127. The next prime is 188121179. The reversal of 188121149 is 941121881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154828249 + 33292900 = 12443^2 + 5770^2 .

It is a cyclic number.

It is not a de Polignac number, because 188121149 - 2²⁴ = 171343933 is a prime.

It is a Chen prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188121179) 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, 94060574 + 94060575.

It is an arithmetic number, because the mean of its divisors is an integer number (94060575).

Almost surely, 2^188121149 is an apocalyptic number.

It is an amenable number.

188121149 is a deficient number, since it is larger than the sum of its proper divisors (1).

188121149 is an equidigital number, since it uses as much as digits as its factorization.

188121149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 35.

The square root of 188121149 is about 13715.7263387689. The cubic root of 188121149 is about 572.9884584985.

The spelling of 188121149 in words is "one hundred eighty-eight million, one hundred twenty-one thousand, one hundred forty-nine".