123936289 has 2 divisors, whose sum is σ = 123936290. Its totient is φ = 123936288.

The previous prime is 123936283. The next prime is 123936331. The reversal of 123936289 is 982639321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96687889 + 27248400 = 9833^2 + 5220^2 .

It is a cyclic number.

It is not a de Polignac number, because 123936289 - 2⁵ = 123936257 is a prime.

It is not a weakly prime, because it can be changed into another prime (123936283) 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, 61968144 + 61968145.

It is an arithmetic number, because the mean of its divisors is an integer number (61968145).

Almost surely, 2^123936289 is an apocalyptic number.

It is an amenable number.

123936289 is a deficient number, since it is larger than the sum of its proper divisors (1).

123936289 is an equidigital number, since it uses as much as digits as its factorization.

123936289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 123936289 is about 11132.6676497594. The cubic root of 123936289 is about 498.5776764948.

The spelling of 123936289 in words is "one hundred twenty-three million, nine hundred thirty-six thousand, two hundred eighty-nine".