129289271918 has 8 divisors (see below), whose sum is σ = 204140955720. Its totient is φ = 61242286680.

The previous prime is 129289271887. The next prime is 129289271927. The reversal of 129289271918 is 819172982921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1701174593 + ... + 1701174668.

It is an arithmetic number, because the mean of its divisors is an integer number (25517619465).

Almost surely, 2^129289271918 is an apocalyptic number.

129289271918 is a deficient number, since it is larger than the sum of its proper divisors (74851683802).

129289271918 is a wasteful number, since it uses less digits than its factorization.

129289271918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402349282.

The product of its digits is 2612736, while the sum is 59.

The spelling of 129289271918 in words is "one hundred twenty-nine billion, two hundred eighty-nine million, two hundred seventy-one thousand, nine hundred eighteen".