129805831125 has 384 divisors, whose sum is σ = 271444193280. Its totient is φ = 61865856000.

The previous prime is 129805831123. The next prime is 129805831213. The reversal of 129805831125 is 521138508921.

It is not a de Polignac number, because 129805831125 - 2¹ = 129805831123 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129805831123) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 2449166599 + ... + 2449166651.

It is an arithmetic number, because the mean of its divisors is an integer number (706885920).

Almost surely, 2^129805831125 is an apocalyptic number.

129805831125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

129805831125 is an abundant number, since it is smaller than the sum of its proper divisors (141638362155).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129805831125 is an frugal number, since it uses more digits than its factorization.

129805831125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 109 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 45.

The spelling of 129805831125 in words is "one hundred twenty-nine billion, eight hundred five million, eight hundred thirty-one thousand, one hundred twenty-five".