129281022 has 160 divisors (see below), whose sum is σ = 346876992. Its totient is φ = 35582976.

The previous prime is 129281017. The next prime is 129281041. The reversal of 129281022 is 220182921.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 823368 + ... + 823524.

Almost surely, 2^129281022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129281022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (173438496).

129281022 is an abundant number, since it is smaller than the sum of its proper divisors (217595970).

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

129281022 is a wasteful number, since it uses less digits than its factorization.

129281022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 129281022 is about 11370.1812650459. The cubic root of 129281022 is about 505.6440783647.

The spelling of 129281022 in words is "one hundred twenty-nine million, two hundred eighty-one thousand, twenty-two".