129568123 has 2 divisors, whose sum is σ = 129568124. Its totient is φ = 129568122.

The previous prime is 129568111. The next prime is 129568133. The reversal of 129568123 is 321865921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 129568123 - 2⁵ = 129568091 is a prime.

It is not a weakly prime, because it can be changed into another prime (129568133) 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, 64784061 + 64784062.

It is an arithmetic number, because the mean of its divisors is an integer number (64784062).

Almost surely, 2^129568123 is an apocalyptic number.

129568123 is a deficient number, since it is larger than the sum of its proper divisors (1).

129568123 is an equidigital number, since it uses as much as digits as its factorization.

129568123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 129568123 is about 11382.7994359911. The cubic root of 129568123 is about 506.0181048790.

The spelling of 129568123 in words is "one hundred twenty-nine million, five hundred sixty-eight thousand, one hundred twenty-three".