129029126251 has 4 divisors (see below), whose sum is σ = 136619074872. Its totient is φ = 121439177632.

The previous prime is 129029126243. The next prime is 129029126257. The reversal of 129029126251 is 152621920921.

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

It is a cyclic number.

It is not a de Polignac number, because 129029126251 - 2³ = 129029126243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129029126257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3794974285 + ... + 3794974318.

It is an arithmetic number, because the mean of its divisors is an integer number (34154768718).

Almost surely, 2^129029126251 is an apocalyptic number.

129029126251 is a deficient number, since it is larger than the sum of its proper divisors (7589948621).

129029126251 is an equidigital number, since it uses as much as digits as its factorization.

129029126251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7589948620.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 129029126251 in words is "one hundred twenty-nine billion, twenty-nine million, one hundred twenty-six thousand, two hundred fifty-one".