129122857289 has 4 divisors (see below), whose sum is σ = 130265537556. Its totient is φ = 127980177024.

The previous prime is 129122857273. The next prime is 129122857301. The reversal of 129122857289 is 982758221921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1069813264 + 128053044025 = 32708^2 + 357845^2 .

It is a cyclic number.

It is not a de Polignac number, because 129122857289 - 2⁴ = 129122857273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129122853289) 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, 571339964 + ... + 571340189.

It is an arithmetic number, because the mean of its divisors is an integer number (32566384389).

Almost surely, 2^129122857289 is an apocalyptic number.

It is an amenable number.

129122857289 is a deficient number, since it is larger than the sum of its proper divisors (1142680267).

129122857289 is a wasteful number, since it uses less digits than its factorization.

129122857289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142680266.

The product of its digits is 2903040, while the sum is 56.

The spelling of 129122857289 in words is "one hundred twenty-nine billion, one hundred twenty-two million, eight hundred fifty-seven thousand, two hundred eighty-nine".