129111696 has 120 divisors (see below), whose sum is σ = 430984320. Its totient is φ = 35278848.

The previous prime is 129111691. The next prime is 129111713. The reversal of 129111696 is 696111921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 129111696.

It is not an unprimeable number, because it can be changed into a prime (129111691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20400 + ... + 25968.

It is an arithmetic number, because the mean of its divisors is an integer number (3591536).

Almost surely, 2^129111696 is an apocalyptic number.

129111696 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129111696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (215492160).

129111696 is an abundant number, since it is smaller than the sum of its proper divisors (301872624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129111696 is a wasteful number, since it uses less digits than its factorization.

129111696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5613 (or 5604 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 129111696 is about 11362.7327698930. The cubic root of 129111696 is about 505.4232259022.

The spelling of 129111696 in words is "one hundred twenty-nine million, one hundred eleven thousand, six hundred ninety-six".