138136489 has 2 divisors, whose sum is σ = 138136490. Its totient is φ = 138136488.

The previous prime is 138136457. The next prime is 138136499. The reversal of 138136489 is 984631831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114126489 + 24010000 = 10683^2 + 4900^2 .

It is a cyclic number.

It is not a de Polignac number, because 138136489 - 2⁵ = 138136457 is a prime.

It is not a weakly prime, because it can be changed into another prime (138136409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69068244 + 69068245.

It is an arithmetic number, because the mean of its divisors is an integer number (69068245).

Almost surely, 2^138136489 is an apocalyptic number.

It is an amenable number.

138136489 is a deficient number, since it is larger than the sum of its proper divisors (1).

138136489 is an equidigital number, since it uses as much as digits as its factorization.

138136489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 43.

The square root of 138136489 is about 11753.1480463746. The cubic root of 138136489 is about 516.9352380073.

It can be divided in two parts, 13813 and 6489, that added together give a palindrome (20302).

The spelling of 138136489 in words is "one hundred thirty-eight million, one hundred thirty-six thousand, four hundred eighty-nine".