129919881 has 16 divisors (see below), whose sum is σ = 213202304. Its totient is φ = 68529024.

The previous prime is 129919871. The next prime is 129919883. The reversal of 129919881 is 188919921.

It is not a de Polignac number, because 129919881 - 2¹⁵ = 129887113 is a prime.

It is a super-2 number, since 2×129919881² = 33758350958108322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 129919881.

It is not an unprimeable number, because it can be changed into a prime (129919883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237676 + ... + 238221.

It is an arithmetic number, because the mean of its divisors is an integer number (13325144).

Almost surely, 2^129919881 is an apocalyptic number.

It is an amenable number.

129919881 is a deficient number, since it is larger than the sum of its proper divisors (83282423).

129919881 is a wasteful number, since it uses less digits than its factorization.

129919881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475920.

The product of its digits is 93312, while the sum is 48.

The square root of 129919881 is about 11398.2402589172. The cubic root of 129919881 is about 506.4756121669.

The spelling of 129919881 in words is "one hundred twenty-nine million, nine hundred nineteen thousand, eight hundred eighty-one".