129191323 has 2 divisors, whose sum is σ = 129191324. Its totient is φ = 129191322.

The previous prime is 129191273. The next prime is 129191327. The reversal of 129191323 is 323191921.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129191323 is a prime.

It is equal to p_7334914 and since 129191323 and 7334914 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (129191327) 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, 64595661 + 64595662.

It is an arithmetic number, because the mean of its divisors is an integer number (64595662).

Almost surely, 2^129191323 is an apocalyptic number.

129191323 is a deficient number, since it is larger than the sum of its proper divisors (1).

129191323 is an equidigital number, since it uses as much as digits as its factorization.

129191323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 31.

The square root of 129191323 is about 11366.2360964393. The cubic root of 129191323 is about 505.5271076981.

The spelling of 129191323 in words is "one hundred twenty-nine million, one hundred ninety-one thousand, three hundred twenty-three".