129411999 has 10 divisors (see below), whose sum is σ = 193319280. Its totient is φ = 86274612.

The previous prime is 129411979. The next prime is 129412001. The reversal of 129411999 is 999114921.

It is a de Polignac number, because none of the positive numbers 2^k-129411999 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129411929) 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 9 ways as a sum of consecutive naturals, for example, 798759 + ... + 798920.

It is an arithmetic number, because the mean of its divisors is an integer number (19331928).

Almost surely, 2^129411999 is an apocalyptic number.

129411999 is a deficient number, since it is larger than the sum of its proper divisors (63907281).

129411999 is an equidigital number, since it uses as much as digits as its factorization.

129411999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597691 (or 1597682 counting only the distinct ones).

The product of its digits is 52488, while the sum is 45.

The square root of 129411999 is about 11375.9394776871. The cubic root of 129411999 is about 505.8147798605.

The spelling of 129411999 in words is "one hundred twenty-nine million, four hundred eleven thousand, nine hundred ninety-nine".