129166249 has 2 divisors, whose sum is σ = 129166250. Its totient is φ = 129166248.

The previous prime is 129166241. The next prime is 129166307. The reversal of 129166249 is 942661921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124992400 + 4173849 = 11180^2 + 2043^2 .

It is a cyclic number.

It is not a de Polignac number, because 129166249 - 2³ = 129166241 is a prime.

It is not a weakly prime, because it can be changed into another prime (129166241) 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, 64583124 + 64583125.

It is an arithmetic number, because the mean of its divisors is an integer number (64583125).

Almost surely, 2^129166249 is an apocalyptic number.

It is an amenable number.

129166249 is a deficient number, since it is larger than the sum of its proper divisors (1).

129166249 is an equidigital number, since it uses as much as digits as its factorization.

129166249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 40.

The square root of 129166249 is about 11365.1330392565. The cubic root of 129166249 is about 505.4944006335.

The spelling of 129166249 in words is "one hundred twenty-nine million, one hundred sixty-six thousand, two hundred forty-nine".