188136449 has 2 divisors, whose sum is σ = 188136450. Its totient is φ = 188136448.

The previous prime is 188136407. The next prime is 188136451. The reversal of 188136449 is 944631881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159567424 + 28569025 = 12632^2 + 5345^2 .

It is a cyclic number.

It is not a de Polignac number, because 188136449 - 2¹⁶ = 188070913 is a prime.

It is a Sophie Germain prime.

Together with 188136451, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (188136049) 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, 94068224 + 94068225.

It is an arithmetic number, because the mean of its divisors is an integer number (94068225).

Almost surely, 2^188136449 is an apocalyptic number.

It is an amenable number.

188136449 is a deficient number, since it is larger than the sum of its proper divisors (1).

188136449 is an equidigital number, since it uses as much as digits as its factorization.

188136449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 165888, while the sum is 44.

The square root of 188136449 is about 13716.2840813392. The cubic root of 188136449 is about 573.0039919030.

The spelling of 188136449 in words is "one hundred eighty-eight million, one hundred thirty-six thousand, four hundred forty-nine".