129198323 has 2 divisors, whose sum is σ = 129198324. Its totient is φ = 129198322.

The previous prime is 129198301. The next prime is 129198331. The reversal of 129198323 is 323891921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129198323 - 2²⁴ = 112421107 is a prime.

It is not a weakly prime, because it can be changed into another prime (129198373) 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 as a sum of consecutive naturals, namely, 64599161 + 64599162.

It is an arithmetic number, because the mean of its divisors is an integer number (64599162).

Almost surely, 2^129198323 is an apocalyptic number.

129198323 is a deficient number, since it is larger than the sum of its proper divisors (1).

129198323 is an equidigital number, since it uses as much as digits as its factorization.

129198323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 129198323 is about 11366.5440218212. The cubic root of 129198323 is about 505.5362378929.

The spelling of 129198323 in words is "one hundred twenty-nine million, one hundred ninety-eight thousand, three hundred twenty-three".