129265729 has 2 divisors, whose sum is σ = 129265730. Its totient is φ = 129265728.

The previous prime is 129265723. The next prime is 129265733. The reversal of 129265729 is 927562921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113465104 + 15800625 = 10652^2 + 3975^2 .

It is a cyclic number.

It is not a de Polignac number, because 129265729 - 2⁷ = 129265601 is a prime.

It is not a weakly prime, because it can be changed into another prime (129265723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64632864 + 64632865.

It is an arithmetic number, because the mean of its divisors is an integer number (64632865).

Almost surely, 2^129265729 is an apocalyptic number.

It is an amenable number.

129265729 is a deficient number, since it is larger than the sum of its proper divisors (1).

129265729 is an equidigital number, since it uses as much as digits as its factorization.

129265729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 129265729 is about 11369.5087404865. The cubic root of 129265729 is about 505.6241395789.

The spelling of 129265729 in words is "one hundred twenty-nine million, two hundred sixty-five thousand, seven hundred twenty-nine".