129806055 has 24 divisors (see below), whose sum is σ = 227532240. Its totient is φ = 68449920.

The previous prime is 129806051. The next prime is 129806071. The reversal of 129806055 is 550608921.

It is a happy number.

It is not a de Polignac number, because 129806055 - 2² = 129806051 is a prime.

It is a super-2 number, since 2×129806055² = 33699223829326050, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129806051) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 12201 + ... + 20210.

It is an arithmetic number, because the mean of its divisors is an integer number (9480510).

Almost surely, 2^129806055 is an apocalyptic number.

129806055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129806055 is a deficient number, since it is larger than the sum of its proper divisors (97726185).

129806055 is a wasteful number, since it uses less digits than its factorization.

129806055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32511 (or 32508 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 129806055 is about 11393.2460256066. The cubic root of 129806055 is about 506.3276570400.

The spelling of 129806055 in words is "one hundred twenty-nine million, eight hundred six thousand, fifty-five".