129217127 has 24 divisors (see below), whose sum is σ = 147498624. Its totient is φ = 112484736.

The previous prime is 129217111. The next prime is 129217133. The reversal of 129217127 is 721712921.

It is not a de Polignac number, because 129217127 - 2⁴ = 129217111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129217093 and 129217102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129217027) 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 23 ways as a sum of consecutive naturals, for example, 579338 + ... + 579560.

It is an arithmetic number, because the mean of its divisors is an integer number (6145776).

Almost surely, 2^129217127 is an apocalyptic number.

129217127 is a deficient number, since it is larger than the sum of its proper divisors (18281497).

129217127 is a wasteful number, since it uses less digits than its factorization.

129217127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347 (or 318 counting only the distinct ones).

The product of its digits is 3528, while the sum is 32.

The square root of 129217127 is about 11367.3711560765. The cubic root of 129217127 is about 505.5607625721.

The spelling of 129217127 in words is "one hundred twenty-nine million, two hundred seventeen thousand, one hundred twenty-seven".