129071391 has 16 divisors (see below), whose sum is σ = 174666240. Its totient is φ = 84768320.

The previous prime is 129071381. The next prime is 129071417. The reversal of 129071391 is 193170921.

It is a cyclic number.

It is not a de Polignac number, because 129071391 - 2⁵ = 129071359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129071381) 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 in 15 ways as a sum of consecutive naturals, for example, 141226 + ... + 142136.

It is an arithmetic number, because the mean of its divisors is an integer number (10916640).

Almost surely, 2^129071391 is an apocalyptic number.

129071391 is a deficient number, since it is larger than the sum of its proper divisors (45594849).

129071391 is an equidigital number, since it uses as much as digits as its factorization.

129071391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1566.

The product of its (nonzero) digits is 3402, while the sum is 33.

The square root of 129071391 is about 11360.9590704306. The cubic root of 129071391 is about 505.3706275091.

The spelling of 129071391 in words is "one hundred twenty-nine million, seventy-one thousand, three hundred ninety-one".