138589441 has 2 divisors, whose sum is σ = 138589442. Its totient is φ = 138589440.

The previous prime is 138589427. The next prime is 138589453. The reversal of 138589441 is 144985831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136399041 + 2190400 = 11679^2 + 1480^2 .

It is an emirp because it is prime and its reverse (144985831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138589441 - 2⁹ = 138588929 is a prime.

It is not a weakly prime, because it can be changed into another prime (138589141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69294720 + 69294721.

It is an arithmetic number, because the mean of its divisors is an integer number (69294721).

Almost surely, 2^138589441 is an apocalyptic number.

It is an amenable number.

138589441 is a deficient number, since it is larger than the sum of its proper divisors (1).

138589441 is an equidigital number, since it uses as much as digits as its factorization.

138589441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 43.

The square root of 138589441 is about 11772.4016666099. The cubic root of 138589441 is about 517.4996348415.

The spelling of 138589441 in words is "one hundred thirty-eight million, five hundred eighty-nine thousand, four hundred forty-one".