129081389 has 2 divisors, whose sum is σ = 129081390. Its totient is φ = 129081388.

The previous prime is 129081373. The next prime is 129081401. The reversal of 129081389 is 983180921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121925764 + 7155625 = 11042^2 + 2675^2 .

It is a cyclic number.

It is not a de Polignac number, because 129081389 - 2⁴ = 129081373 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129081319) 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, 64540694 + 64540695.

It is an arithmetic number, because the mean of its divisors is an integer number (64540695).

Almost surely, 2^129081389 is an apocalyptic number.

It is an amenable number.

129081389 is a deficient number, since it is larger than the sum of its proper divisors (1).

129081389 is an equidigital number, since it uses as much as digits as its factorization.

129081389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 129081389 is about 11361.3990775784. The cubic root of 129081389 is about 505.3836760115.

The spelling of 129081389 in words is "one hundred twenty-nine million, eighty-one thousand, three hundred eighty-nine".