129409271 has 2 divisors, whose sum is σ = 129409272. Its totient is φ = 129409270.

The previous prime is 129409249. The next prime is 129409279. The reversal of 129409271 is 172904921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129409271 - 2¹⁸ = 129147127 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 (129409279) 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, 64704635 + 64704636.

It is an arithmetic number, because the mean of its divisors is an integer number (64704636).

Almost surely, 2^129409271 is an apocalyptic number.

129409271 is a deficient number, since it is larger than the sum of its proper divisors (1).

129409271 is an equidigital number, since it uses as much as digits as its factorization.

129409271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 129409271 is about 11375.8195748702. The cubic root of 129409271 is about 505.8112256501.

The spelling of 129409271 in words is "one hundred twenty-nine million, four hundred nine thousand, two hundred seventy-one".