138109193 has 2 divisors, whose sum is σ = 138109194. Its totient is φ = 138109192.

The previous prime is 138109189. The next prime is 138109243. The reversal of 138109193 is 391901831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70425664 + 67683529 = 8392^2 + 8227^2 .

It is an emirp because it is prime and its reverse (391901831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138109193 - 2² = 138109189 is a prime.

It is a super-2 number, since 2×138109193² = 38148298382222498, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (138109183) 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, 69054596 + 69054597.

It is an arithmetic number, because the mean of its divisors is an integer number (69054597).

Almost surely, 2^138109193 is an apocalyptic number.

It is an amenable number.

138109193 is a deficient number, since it is larger than the sum of its proper divisors (1).

138109193 is an equidigital number, since it uses as much as digits as its factorization.

138109193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 138109193 is about 11751.9867682022. The cubic root of 138109193 is about 516.9011866767.

The spelling of 138109193 in words is "one hundred thirty-eight million, one hundred nine thousand, one hundred ninety-three".