129170128 has 10 divisors (see below), whose sum is σ = 250267154. Its totient is φ = 64585056.

The previous prime is 129170101. The next prime is 129170141. The reversal of 129170128 is 821071921.

It can be written as a sum of positive squares in only one way, i.e., 111260304 + 17909824 = 10548^2 + 4232^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129170128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4036551 + ... + 4036582.

Almost surely, 2^129170128 is an apocalyptic number.

It is an amenable number.

129170128 is a deficient number, since it is larger than the sum of its proper divisors (121097026).

129170128 is an equidigital number, since it uses as much as digits as its factorization.

129170128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8073141 (or 8073135 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 129170128 is about 11365.3036914990. The cubic root of 129170128 is about 505.4994607612.

The spelling of 129170128 in words is "one hundred twenty-nine million, one hundred seventy thousand, one hundred twenty-eight".