138632171 has 2 divisors, whose sum is σ = 138632172. Its totient is φ = 138632170.

The previous prime is 138632167. The next prime is 138632173. The reversal of 138632171 is 171236831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138632171 - 2² = 138632167 is a prime.

It is a Sophie Germain prime.

Together with 138632173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138632173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69316085 + 69316086.

It is an arithmetic number, because the mean of its divisors is an integer number (69316086).

Almost surely, 2^138632171 is an apocalyptic number.

138632171 is a deficient number, since it is larger than the sum of its proper divisors (1).

138632171 is an equidigital number, since it uses as much as digits as its factorization.

138632171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 138632171 is about 11774.2163645824. The cubic root of 138632171 is about 517.5528146677.

The spelling of 138632171 in words is "one hundred thirty-eight million, six hundred thirty-two thousand, one hundred seventy-one".