129127810791 has 16 divisors (see below), whose sum is σ = 196776683264. Its totient is φ = 73783384704.

The previous prime is 129127810703. The next prime is 129127810813. The reversal of 129127810791 is 197018721921.

It is not a de Polignac number, because 129127810791 - 2¹⁸ = 129127548647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 129127810791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129127810391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265215 + ... + 573231.

It is an arithmetic number, because the mean of its divisors is an integer number (12298542704).

Almost surely, 2^129127810791 is an apocalyptic number.

129127810791 is a deficient number, since it is larger than the sum of its proper divisors (67648872473).

129127810791 is a wasteful number, since it uses less digits than its factorization.

129127810791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327990.

The product of its (nonzero) digits is 127008, while the sum is 48.

The spelling of 129127810791 in words is "one hundred twenty-nine billion, one hundred twenty-seven million, eight hundred ten thousand, seven hundred ninety-one".