129555985 has 16 divisors (see below), whose sum is σ = 168041664. Its totient is φ = 95320512.

The previous prime is 129555977. The next prime is 129555989. The reversal of 129555985 is 589555921.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 129555985 - 2³ = 129555977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129555989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14874 + ... + 21916.

It is an arithmetic number, because the mean of its divisors is an integer number (10502604).

Almost surely, 2^129555985 is an apocalyptic number.

It is an amenable number.

129555985 is a deficient number, since it is larger than the sum of its proper divisors (38485679).

129555985 is a wasteful number, since it uses less digits than its factorization.

129555985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7344.

The product of its digits is 810000, while the sum is 49.

The square root of 129555985 is about 11382.2662506199. The cubic root of 129555985 is about 506.0023030511.

The spelling of 129555985 in words is "one hundred twenty-nine million, five hundred fifty-five thousand, nine hundred eighty-five".