129201899 has 2 divisors, whose sum is σ = 129201900. Its totient is φ = 129201898.

The previous prime is 129201889. The next prime is 129201901. The reversal of 129201899 is 998102921.

It is a strong prime.

It is an emirp because it is prime and its reverse (998102921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129201899 - 2²⁰ = 128153323 is a prime.

Together with 129201901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129201829) 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 as a sum of consecutive naturals, namely, 64600949 + 64600950.

It is an arithmetic number, because the mean of its divisors is an integer number (64600950).

Almost surely, 2^129201899 is an apocalyptic number.

129201899 is a deficient number, since it is larger than the sum of its proper divisors (1).

129201899 is an equidigital number, since it uses as much as digits as its factorization.

129201899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 129201899 is about 11366.7013244828. The cubic root of 129201899 is about 505.5409019909.

The spelling of 129201899 in words is "one hundred twenty-nine million, two hundred one thousand, eight hundred ninety-nine".