129543019 has 4 divisors (see below), whose sum is σ = 130085280. Its totient is φ = 129000760.

The previous prime is 129543013. The next prime is 129543041. The reversal of 129543019 is 910345921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 129543019 - 2¹⁹ = 129018731 is a prime.

It is a super-2 number, since 2×129543019² = 33562787543268722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129543013) 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, 270772 + ... + 271249.

It is an arithmetic number, because the mean of its divisors is an integer number (32521320).

Almost surely, 2^129543019 is an apocalyptic number.

129543019 is a deficient number, since it is larger than the sum of its proper divisors (542261).

129543019 is an equidigital number, since it uses as much as digits as its factorization.

129543019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542260.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 129543019 is about 11381.6966661390. The cubic root of 129543019 is about 505.9854222029.

The spelling of 129543019 in words is "one hundred twenty-nine million, five hundred forty-three thousand, nineteen".