129054129 has 4 divisors (see below), whose sum is σ = 172072176. Its totient is φ = 86036084.

The previous prime is 129054119. The next prime is 129054161. The reversal of 129054129 is 921450921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 921450921 = 3 ⋅307150307.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129054129 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 129054129.

It is not an unprimeable number, because it can be changed into a prime (129054119) 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, 21509019 + ... + 21509024.

It is an arithmetic number, because the mean of its divisors is an integer number (43018044).

Almost surely, 2^129054129 is an apocalyptic number.

It is an amenable number.

129054129 is a deficient number, since it is larger than the sum of its proper divisors (43018047).

129054129 is an equidigital number, since it uses as much as digits as its factorization.

129054129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43018046.

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 129054129 is about 11360.1993380398. The cubic root of 129054129 is about 505.3480970923.

The spelling of 129054129 in words is "one hundred twenty-nine million, fifty-four thousand, one hundred twenty-nine".