129211885 has 8 divisors (see below), whose sum is σ = 169150176. Its totient is φ = 93972240.

The previous prime is 129211871. The next prime is 129211889. The reversal of 129211885 is 588112921.

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

It is not a de Polignac number, because 129211885 - 2⁵ = 129211853 is a prime.

It is a super-2 number, since 2×129211885² = 33391422450506450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129211889) 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 7 ways as a sum of consecutive naturals, for example, 1174599 + ... + 1174708.

It is an arithmetic number, because the mean of its divisors is an integer number (21143772).

Almost surely, 2^129211885 is an apocalyptic number.

It is an amenable number.

129211885 is a deficient number, since it is larger than the sum of its proper divisors (39938291).

129211885 is a wasteful number, since it uses less digits than its factorization.

129211885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2349323.

The product of its digits is 11520, while the sum is 37.

The square root of 129211885 is about 11367.1405815183. The cubic root of 129211885 is about 505.5539260548.

The spelling of 129211885 in words is "one hundred twenty-nine million, two hundred eleven thousand, eight hundred eighty-five".