129129275 has 12 divisors (see below), whose sum is σ = 174677064. Its totient is φ = 93912000.

The previous prime is 129129271. The next prime is 129129283. The reversal of 129129275 is 572921921.

It is not a de Polignac number, because 129129275 - 2² = 129129271 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129129271) 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 11 ways as a sum of consecutive naturals, for example, 234506 + ... + 235055.

It is an arithmetic number, because the mean of its divisors is an integer number (14556422).

Almost surely, 2^129129275 is an apocalyptic number.

129129275 is a deficient number, since it is larger than the sum of its proper divisors (45547789).

129129275 is a wasteful number, since it uses less digits than its factorization.

129129275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469582 (or 469577 counting only the distinct ones).

The product of its digits is 22680, while the sum is 38.

The square root of 129129275 is about 11363.5062810736. The cubic root of 129129275 is about 505.4461632295.

The spelling of 129129275 in words is "one hundred twenty-nine million, one hundred twenty-nine thousand, two hundred seventy-five".