129550255 has 4 divisors (see below), whose sum is σ = 155460312. Its totient is φ = 103640200.

The previous prime is 129550249. The next prime is 129550259. The reversal of 129550255 is 552055921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 552055921 = 547 ⋅1009243.

It is not a de Polignac number, because 129550255 - 2³ = 129550247 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129550255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129550259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12955021 + ... + 12955030.

It is an arithmetic number, because the mean of its divisors is an integer number (38865078).

Almost surely, 2^129550255 is an apocalyptic number.

129550255 is a deficient number, since it is larger than the sum of its proper divisors (25910057).

129550255 is an equidigital number, since it uses as much as digits as its factorization.

129550255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25910056.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 129550255 is about 11382.0145404933. The cubic root of 129550255 is about 505.9948431205.

The spelling of 129550255 in words is "one hundred twenty-nine million, five hundred fifty thousand, two hundred fifty-five".