129199219 has 4 divisors (see below), whose sum is σ = 132203896. Its totient is φ = 126194544.

The previous prime is 129199181. The next prime is 129199223. The reversal of 129199219 is 912991921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912991921 = 7211 ⋅126611.

It is a cyclic number.

It is not a de Polignac number, because 129199219 - 2¹⁵ = 129166451 is a prime.

It is a super-2 number, since 2×129199219² = 33384876380419922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 3004633 = 129199219 / (1 + 2 + 9 + 1 + 9 + 9 + 2 + 1 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129199019) 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 3 ways as a sum of consecutive naturals, for example, 1502274 + ... + 1502359.

It is an arithmetic number, because the mean of its divisors is an integer number (33050974).

Almost surely, 2^129199219 is an apocalyptic number.

129199219 is the 6563-rd hex number.

129199219 is a deficient number, since it is larger than the sum of its proper divisors (3004677).

129199219 is an equidigital number, since it uses as much as digits as its factorization.

129199219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004676.

The product of its digits is 26244, while the sum is 43.

The square root of 129199219 is about 11366.5834356679. The cubic root of 129199219 is about 505.5374065340.

The spelling of 129199219 in words is "one hundred twenty-nine million, one hundred ninety-nine thousand, two hundred nineteen".