129085899 has 8 divisors (see below), whose sum is σ = 175362192. Its totient is φ = 84433440.

The previous prime is 129085849. The next prime is 129085907. The reversal of 129085899 is 998580921.

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

It is not a de Polignac number, because 129085899 - 2⁷ = 129085771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129085849) 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, 405772 + ... + 406089.

It is an arithmetic number, because the mean of its divisors is an integer number (21920274).

Almost surely, 2^129085899 is an apocalyptic number.

129085899 is a deficient number, since it is larger than the sum of its proper divisors (46276293).

129085899 is an equidigital number, since it uses as much as digits as its factorization.

129085899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811917.

The product of its (nonzero) digits is 466560, while the sum is 51.

The square root of 129085899 is about 11361.5975549216. The cubic root of 129085899 is about 505.3895618428.

The spelling of 129085899 in words is "one hundred twenty-nine million, eighty-five thousand, eight hundred ninety-nine".