138643093 has 2 divisors, whose sum is σ = 138643094. Its totient is φ = 138643092.

The previous prime is 138643081. The next prime is 138643111. The reversal of 138643093 is 390346831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106357969 + 32285124 = 10313^2 + 5682^2 .

It is a cyclic number.

It is not a de Polignac number, because 138643093 - 2⁵ = 138643061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138643013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69321546 + 69321547.

It is an arithmetic number, because the mean of its divisors is an integer number (69321547).

Almost surely, 2^138643093 is an apocalyptic number.

It is an amenable number.

138643093 is a deficient number, since it is larger than the sum of its proper divisors (1).

138643093 is an equidigital number, since it uses as much as digits as its factorization.

138643093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 138643093 is about 11774.6801655077. The cubic root of 138643093 is about 517.5664059416.

The spelling of 138643093 in words is "one hundred thirty-eight million, six hundred forty-three thousand, ninety-three".