129423361 has 2 divisors, whose sum is σ = 129423362. Its totient is φ = 129423360.

The previous prime is 129423353. The next prime is 129423407. The reversal of 129423361 is 163324921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69205761 + 60217600 = 8319^2 + 7760^2 .

It is a cyclic number.

It is not a de Polignac number, because 129423361 - 2³ = 129423353 is a prime.

It is not a weakly prime, because it can be changed into another prime (129423331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64711680 + 64711681.

It is an arithmetic number, because the mean of its divisors is an integer number (64711681).

Almost surely, 2^129423361 is an apocalyptic number.

It is an amenable number.

129423361 is a deficient number, since it is larger than the sum of its proper divisors (1).

129423361 is an equidigital number, since it uses as much as digits as its factorization.

129423361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 129423361 is about 11376.4388540527. The cubic root of 129423361 is about 505.8295824532.

The spelling of 129423361 in words is "one hundred twenty-nine million, four hundred twenty-three thousand, three hundred sixty-one".