123329981729 has 2 divisors, whose sum is σ = 123329981730. Its totient is φ = 123329981728.

The previous prime is 123329981693. The next prime is 123329981743. The reversal of 123329981729 is 927189923321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119301160000 + 4028821729 = 345400^2 + 63473^2 .

It is a cyclic number.

It is not a de Polignac number, because 123329981729 - 2²⁸ = 123061546273 is a prime.

It is not a weakly prime, because it can be changed into another prime (123329981329) 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, 61664990864 + 61664990865.

It is an arithmetic number, because the mean of its divisors is an integer number (61664990865).

Almost surely, 2^123329981729 is an apocalyptic number.

It is an amenable number.

123329981729 is a deficient number, since it is larger than the sum of its proper divisors (1).

123329981729 is an equidigital number, since it uses as much as digits as its factorization.

123329981729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 56.

The spelling of 123329981729 in words is "one hundred twenty-three billion, three hundred twenty-nine million, nine hundred eighty-one thousand, seven hundred twenty-nine".