126171889 has 2 divisors, whose sum is σ = 126171890. Its totient is φ = 126171888.

The previous prime is 126171827. The next prime is 126171893. The reversal of 126171889 is 988171621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71115489 + 55056400 = 8433^2 + 7420^2 .

It is a cyclic number.

It is not a de Polignac number, because 126171889 - 2¹⁵ = 126139121 is a prime.

It is not a weakly prime, because it can be changed into another prime (126171809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63085944 + 63085945.

It is an arithmetic number, because the mean of its divisors is an integer number (63085945).

Almost surely, 2^126171889 is an apocalyptic number.

It is an amenable number.

126171889 is a deficient number, since it is larger than the sum of its proper divisors (1).

126171889 is an equidigital number, since it uses as much as digits as its factorization.

126171889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 43.

The square root of 126171889 is about 11232.6260954418. The cubic root of 126171889 is about 501.5576610119.

The spelling of 126171889 in words is "one hundred twenty-six million, one hundred seventy-one thousand, eight hundred eighty-nine".