129389089 has 2 divisors, whose sum is σ = 129389090. Its totient is φ = 129389088.

The previous prime is 129389081. The next prime is 129389119. The reversal of 129389089 is 980983921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123099025 + 6290064 = 11095^2 + 2508^2 .

It is a cyclic number.

It is not a de Polignac number, because 129389089 - 2³ = 129389081 is a prime.

It is not a weakly prime, because it can be changed into another prime (129389081) 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, 64694544 + 64694545.

It is an arithmetic number, because the mean of its divisors is an integer number (64694545).

Almost surely, 2^129389089 is an apocalyptic number.

It is an amenable number.

129389089 is a deficient number, since it is larger than the sum of its proper divisors (1).

129389089 is an equidigital number, since it uses as much as digits as its factorization.

129389089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 49.

The square root of 129389089 is about 11374.9324833161. The cubic root of 129389089 is about 505.7849297163.

The spelling of 129389089 in words is "one hundred twenty-nine million, three hundred eighty-nine thousand, eighty-nine".