129555 has 12 divisors (see below), whose sum is σ = 224640. Its totient is φ = 69072.

The previous prime is 129553. The next prime is 129581. The reversal of 129555 is 555921.

It is not a de Polignac number, because 129555 - 2¹ = 129553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1395 + ... + 1484.

It is an arithmetic number, because the mean of its divisors is an integer number (18720).

2¹²⁹⁵⁵⁵ is an apocalyptic number.

129555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

129555 is a deficient number, since it is larger than the sum of its proper divisors (95085).

129555 is a wasteful number, since it uses less digits than its factorization.

129555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890 (or 2887 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 129555 is about 359.9374945737. The cubic root of 129555 is about 50.6001020688.

The spelling of 129555 in words is "one hundred twenty-nine thousand, five hundred fifty-five".