138197671 has 2 divisors, whose sum is σ = 138197672. Its totient is φ = 138197670.

The previous prime is 138197651. The next prime is 138197681. The reversal of 138197671 is 176791831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138197671 - 2⁹ = 138197159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138197651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69098835 + 69098836.

It is an arithmetic number, because the mean of its divisors is an integer number (69098836).

Almost surely, 2^138197671 is an apocalyptic number.

138197671 is a deficient number, since it is larger than the sum of its proper divisors (1).

138197671 is an equidigital number, since it uses as much as digits as its factorization.

138197671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 43.

The square root of 138197671 is about 11755.7505502626. The cubic root of 138197671 is about 517.0115452977.

The spelling of 138197671 in words is "one hundred thirty-eight million, one hundred ninety-seven thousand, six hundred seventy-one".