138195047 has 2 divisors, whose sum is σ = 138195048. Its totient is φ = 138195046.

The previous prime is 138195019. The next prime is 138195053. The reversal of 138195047 is 740591831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138195047 - 2⁶ = 138194983 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138195047.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138195007) 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, 69097523 + 69097524.

It is an arithmetic number, because the mean of its divisors is an integer number (69097524).

Almost surely, 2^138195047 is an apocalyptic number.

138195047 is a deficient number, since it is larger than the sum of its proper divisors (1).

138195047 is an equidigital number, since it uses as much as digits as its factorization.

138195047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 138195047 is about 11755.6389447788. The cubic root of 138195047 is about 517.0082730601.

The spelling of 138195047 in words is "one hundred thirty-eight million, one hundred ninety-five thousand, forty-seven".