129007609 has 2 divisors, whose sum is σ = 129007610. Its totient is φ = 129007608.

The previous prime is 129007583. The next prime is 129007649. The reversal of 129007609 is 906700921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76125625 + 52881984 = 8725^2 + 7272^2 .

It is a cyclic number.

It is not a de Polignac number, because 129007609 - 2¹⁵ = 128974841 is a prime.

It is not a weakly prime, because it can be changed into another prime (129007649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64503804 + 64503805.

It is an arithmetic number, because the mean of its divisors is an integer number (64503805).

Almost surely, 2^129007609 is an apocalyptic number.

It is an amenable number.

129007609 is a deficient number, since it is larger than the sum of its proper divisors (1).

129007609 is an equidigital number, since it uses as much as digits as its factorization.

129007609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 129007609 is about 11358.1516542085. The cubic root of 129007609 is about 505.2873690372.

The spelling of 129007609 in words is "one hundred twenty-nine million, seven thousand, six hundred nine".