129555755 has 12 divisors (see below), whose sum is σ = 180849600. Its totient is φ = 88838064.

The previous prime is 129555733. The next prime is 129555763. The reversal of 129555755 is 557555921.

It is not a de Polignac number, because 129555755 - 2¹⁰ = 129554731 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 264155 + ... + 264644.

It is an arithmetic number, because the mean of its divisors is an integer number (15070800).

Almost surely, 2^129555755 is an apocalyptic number.

129555755 is a deficient number, since it is larger than the sum of its proper divisors (51293845).

129555755 is an equidigital number, since it uses as much as digits as its factorization.

129555755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528818 (or 528811 counting only the distinct ones).

The product of its digits is 393750, while the sum is 44.

The square root of 129555755 is about 11382.2561471793. The cubic root of 129555755 is about 506.0020036166.

The spelling of 129555755 in words is "one hundred twenty-nine million, five hundred fifty-five thousand, seven hundred fifty-five".