129647129 has 2 divisors, whose sum is σ = 129647130. Its totient is φ = 129647128.

The previous prime is 129647059. The next prime is 129647173. The reversal of 129647129 is 921746921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129049600 + 597529 = 11360^2 + 773^2 .

It is a cyclic number.

It is not a de Polignac number, because 129647129 - 2¹⁶ = 129581593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129647179) 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, 64823564 + 64823565.

It is an arithmetic number, because the mean of its divisors is an integer number (64823565).

Almost surely, 2^129647129 is an apocalyptic number.

It is an amenable number.

129647129 is a deficient number, since it is larger than the sum of its proper divisors (1).

129647129 is an equidigital number, since it uses as much as digits as its factorization.

129647129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 41.

The square root of 129647129 is about 11386.2693187892. The cubic root of 129647129 is about 506.1209345525.

The spelling of 129647129 in words is "one hundred twenty-nine million, six hundred forty-seven thousand, one hundred twenty-nine".