129197023 has 2 divisors, whose sum is σ = 129197024. Its totient is φ = 129197022.

The previous prime is 129197021. The next prime is 129197039. The reversal of 129197023 is 320791921.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129197023 - 2¹ = 129197021 is a prime.

Together with 129197021, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 129197023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129197021) 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, 64598511 + 64598512.

It is an arithmetic number, because the mean of its divisors is an integer number (64598512).

Almost surely, 2^129197023 is an apocalyptic number.

129197023 is a deficient number, since it is larger than the sum of its proper divisors (1).

129197023 is an equidigital number, since it uses as much as digits as its factorization.

129197023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 129197023 is about 11366.4868363096. The cubic root of 129197023 is about 505.5345423102.

The spelling of 129197023 in words is "one hundred twenty-nine million, one hundred ninety-seven thousand, twenty-three".