129105391 has 8 divisors (see below), whose sum is σ = 131462480. Its totient is φ = 126764352.

The previous prime is 129105343. The next prime is 129105401. The reversal of 129105391 is 193501921.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 129105391 - 2⁹ = 129104879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129105331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12856 + ... + 20578.

It is an arithmetic number, because the mean of its divisors is an integer number (16432810).

Almost surely, 2^129105391 is an apocalyptic number.

129105391 is a deficient number, since it is larger than the sum of its proper divisors (2357089).

129105391 is an equidigital number, since it uses as much as digits as its factorization.

129105391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8025.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 129105391 is about 11362.4553244446. The cubic root of 129105391 is about 505.4149985420.

The spelling of 129105391 in words is "one hundred twenty-nine million, one hundred five thousand, three hundred ninety-one".