126808189 has 2 divisors, whose sum is σ = 126808190. Its totient is φ = 126808188.

The previous prime is 126808183. The next prime is 126808211. The reversal of 126808189 is 981808621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105740089 + 21068100 = 10283^2 + 4590^2 .

It is a cyclic number.

It is not a de Polignac number, because 126808189 - 2⁹ = 126807677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126808183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63404094 + 63404095.

It is an arithmetic number, because the mean of its divisors is an integer number (63404095).

Almost surely, 2^126808189 is an apocalyptic number.

It is an amenable number.

126808189 is a deficient number, since it is larger than the sum of its proper divisors (1).

126808189 is an equidigital number, since it uses as much as digits as its factorization.

126808189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 43.

The square root of 126808189 is about 11260.9142168831. The cubic root of 126808189 is about 502.3993861411.

The spelling of 126808189 in words is "one hundred twenty-six million, eight hundred eight thousand, one hundred eighty-nine".