129661092 has 108 divisors (see below), whose sum is σ = 377775216. Its totient is φ = 37182240.

The previous prime is 129661079. The next prime is 129661093. The reversal of 129661092 is 290166921.

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

It is not an unprimeable number, because it can be changed into a prime (129661093) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 142503 + ... + 143409.

Almost surely, 2^129661092 is an apocalyptic number.

129661092 is a gapful number since it is divisible by the number (12) 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 129661092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188887608).

129661092 is an abundant number, since it is smaller than the sum of its proper divisors (248114124).

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

129661092 is a wasteful number, since it uses less digits than its factorization.

129661092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 942 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 129661092 is about 11386.8824530685. The cubic root of 129661092 is about 506.1391036472.

The spelling of 129661092 in words is "one hundred twenty-nine million, six hundred sixty-one thousand, ninety-two".