129009838679 has 4 divisors (see below), whose sum is σ = 129022431576. Its totient is φ = 128997245784.

The previous prime is 129009838619. The next prime is 129009838687. The reversal of 129009838679 is 976838900921.

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 129009838679 - 2⁸ = 129009838423 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 (129009838619) 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, 6281069 + ... + 6301574.

It is an arithmetic number, because the mean of its divisors is an integer number (32255607894).

Almost surely, 2^129009838679 is an apocalyptic number.

129009838679 is a deficient number, since it is larger than the sum of its proper divisors (12592897).

129009838679 is a wasteful number, since it uses less digits than its factorization.

129009838679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12592896.

The product of its (nonzero) digits is 11757312, while the sum is 62.

The spelling of 129009838679 in words is "one hundred twenty-nine billion, nine million, eight hundred thirty-eight thousand, six hundred seventy-nine".