138458171 has 2 divisors, whose sum is σ = 138458172. Its totient is φ = 138458170.

The previous prime is 138458167. The next prime is 138458239. The reversal of 138458171 is 171854831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138458171 - 2² = 138458167 is a prime.

It is not a weakly prime, because it can be changed into another prime (138458141) 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, 69229085 + 69229086.

It is an arithmetic number, because the mean of its divisors is an integer number (69229086).

Almost surely, 2^138458171 is an apocalyptic number.

138458171 is a deficient number, since it is larger than the sum of its proper divisors (1).

138458171 is an equidigital number, since it uses as much as digits as its factorization.

138458171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 38.

The square root of 138458171 is about 11766.8250178202. The cubic root of 138458171 is about 517.3361937308.

The spelling of 138458171 in words is "one hundred thirty-eight million, four hundred fifty-eight thousand, one hundred seventy-one".