129446509 has 2 divisors, whose sum is σ = 129446510. Its totient is φ = 129446508.

The previous prime is 129446503. The next prime is 129446519. The reversal of 129446509 is 905644921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113422500 + 16024009 = 10650^2 + 4003^2 .

It is a cyclic number.

It is not a de Polignac number, because 129446509 - 2³ = 129446501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129446501) 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, 64723254 + 64723255.

It is an arithmetic number, because the mean of its divisors is an integer number (64723255).

Almost surely, 2^129446509 is an apocalyptic number.

It is an amenable number.

129446509 is a deficient number, since it is larger than the sum of its proper divisors (1).

129446509 is an equidigital number, since it uses as much as digits as its factorization.

129446509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 129446509 is about 11377.4561743827. The cubic root of 129446509 is about 505.8597373523.

The spelling of 129446509 in words is "one hundred twenty-nine million, four hundred forty-six thousand, five hundred nine".