129280970899 has 4 divisors (see below), whose sum is σ = 129281691280. Its totient is φ = 129280250520.

The previous prime is 129280970867. The next prime is 129280970921. The reversal of 129280970899 is 998079082921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 998079082921 = 116239 ⋅8586439.

It is a cyclic number.

It is not a de Polignac number, because 129280970899 - 2⁵ = 129280970867 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129280970899.

It is not an unprimeable number, because it can be changed into a prime (129280971899) 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, 148069 + ... + 529609.

It is an arithmetic number, because the mean of its divisors is an integer number (32320422820).

Almost surely, 2^129280970899 is an apocalyptic number.

129280970899 is a deficient number, since it is larger than the sum of its proper divisors (720381).

129280970899 is an equidigital number, since it uses as much as digits as its factorization.

129280970899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720380.

The product of its (nonzero) digits is 11757312, while the sum is 64.

The spelling of 129280970899 in words is "one hundred twenty-nine billion, two hundred eighty million, nine hundred seventy thousand, eight hundred ninety-nine".