138654871 has 2 divisors, whose sum is σ = 138654872. Its totient is φ = 138654870.

The previous prime is 138654853. The next prime is 138654881. The reversal of 138654871 is 178456831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138654871 - 2⁹ = 138654359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138654851) 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, 69327435 + 69327436.

It is an arithmetic number, because the mean of its divisors is an integer number (69327436).

Almost surely, 2^138654871 is an apocalyptic number.

138654871 is a deficient number, since it is larger than the sum of its proper divisors (1).

138654871 is an equidigital number, since it uses as much as digits as its factorization.

138654871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 43.

The square root of 138654871 is about 11775.1802958596. The cubic root of 138654871 is about 517.5810616170.

The spelling of 138654871 in words is "one hundred thirty-eight million, six hundred fifty-four thousand, eight hundred seventy-one".