129085911 has 12 divisors (see below), whose sum is σ = 186713592. Its totient is φ = 85939056.

The previous prime is 129085909. The next prime is 129085949. The reversal of 129085911 is 119580921.

It is not a de Polignac number, because 129085911 - 2¹ = 129085909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129085991) 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, 2661 + ... + 16286.

It is an arithmetic number, because the mean of its divisors is an integer number (15559466).

Almost surely, 2^129085911 is an apocalyptic number.

129085911 is a deficient number, since it is larger than the sum of its proper divisors (57627681).

129085911 is a wasteful number, since it uses less digits than its factorization.

129085911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19710 (or 19707 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 129085911 is about 11361.5980830163. The cubic root of 129085911 is about 505.3895775033.

The spelling of 129085911 in words is "one hundred twenty-nine million, eighty-five thousand, nine hundred eleven".