129047689 has 2 divisors, whose sum is σ = 129047690. Its totient is φ = 129047688.

The previous prime is 129047669. The next prime is 129047729. The reversal of 129047689 is 986740921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118374400 + 10673289 = 10880^2 + 3267^2 .

It is a cyclic number.

It is not a de Polignac number, because 129047689 - 2⁵ = 129047657 is a prime.

It is not a weakly prime, because it can be changed into another prime (129047669) 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, 64523844 + 64523845.

It is an arithmetic number, because the mean of its divisors is an integer number (64523845).

Almost surely, 2^129047689 is an apocalyptic number.

It is an amenable number.

129047689 is a deficient number, since it is larger than the sum of its proper divisors (1).

129047689 is an equidigital number, since it uses as much as digits as its factorization.

129047689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 129047689 is about 11359.9158887731. The cubic root of 129047689 is about 505.3396910694.

The spelling of 129047689 in words is "one hundred twenty-nine million, forty-seven thousand, six hundred eighty-nine".