129581855 has 16 divisors (see below), whose sum is σ = 167741280. Its totient is φ = 95530368.

The previous prime is 129581827. The next prime is 129581857. The reversal of 129581855 is 558185921.

It is a cyclic number.

It is not a de Polignac number, because 129581855 - 2⁶ = 129581791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129581857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48956 + ... + 51534.

It is an arithmetic number, because the mean of its divisors is an integer number (10483830).

Almost surely, 2^129581855 is an apocalyptic number.

129581855 is a deficient number, since it is larger than the sum of its proper divisors (38159425).

129581855 is a wasteful number, since it uses less digits than its factorization.

129581855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370.

The product of its digits is 144000, while the sum is 44.

The square root of 129581855 is about 11383.4026108190. The cubic root of 129581855 is about 506.0359806625.

The spelling of 129581855 in words is "one hundred twenty-nine million, five hundred eighty-one thousand, eight hundred fifty-five".