129085805 has 16 divisors (see below), whose sum is σ = 158034240. Its totient is φ = 101192832.

The previous prime is 129085787. The next prime is 129085807. The reversal of 129085805 is 508580921.

It is a cyclic number.

It is not a de Polignac number, because 129085805 - 2²⁴ = 112308589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129085807) 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, 137297 + ... + 138233.

It is an arithmetic number, because the mean of its divisors is an integer number (9877140).

Almost surely, 2^129085805 is an apocalyptic number.

It is an amenable number.

129085805 is a deficient number, since it is larger than the sum of its proper divisors (28948435).

129085805 is an equidigital number, since it uses as much as digits as its factorization.

129085805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 129085805 is about 11361.5934181786. The cubic root of 129085805 is about 505.3894391683.

The spelling of 129085805 in words is "one hundred twenty-nine million, eighty-five thousand, eight hundred five".