129181120 has 56 divisors (see below), whose sum is σ = 308610000. Its totient is φ = 51505152.

The previous prime is 129181081. The next prime is 129181127. The reversal of 129181120 is 21181921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129181127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159276 + ... + 160084.

Almost surely, 2^129181120 is an apocalyptic number.

129181120 is a gapful number since it is divisible by the number (10) 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 129181120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154305000).

129181120 is an abundant number, since it is smaller than the sum of its proper divisors (179428880).

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

129181120 is an equidigital number, since it uses as much as digits as its factorization.

129181120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325 (or 1315 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 129181120 is about 11365.7872582589. The cubic root of 129181120 is about 505.5137991963.

The spelling of 129181120 in words is "one hundred twenty-nine million, one hundred eighty-one thousand, one hundred twenty".