129161312927 has 4 divisors (see below), whose sum is σ = 131909426016. Its totient is φ = 126413199840.

The previous prime is 129161312921. The next prime is 129161312939. The reversal of 129161312927 is 729213161921.

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 129161312927 - 2⁸ = 129161312671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129161312921) 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, 1374056474 + ... + 1374056567.

It is an arithmetic number, because the mean of its divisors is an integer number (32977356504).

Almost surely, 2^129161312927 is an apocalyptic number.

129161312927 is a deficient number, since it is larger than the sum of its proper divisors (2748113089).

129161312927 is an equidigital number, since it uses as much as digits as its factorization.

129161312927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748113088.

The product of its digits is 81648, while the sum is 44.

The spelling of 129161312927 in words is "one hundred twenty-nine billion, one hundred sixty-one million, three hundred twelve thousand, nine hundred twenty-seven".