138539671 has 2 divisors, whose sum is σ = 138539672. Its totient is φ = 138539670.

The previous prime is 138539663. The next prime is 138539677. The reversal of 138539671 is 176935831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138539671 - 2³ = 138539663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138539677) 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, 69269835 + 69269836.

It is an arithmetic number, because the mean of its divisors is an integer number (69269836).

Almost surely, 2^138539671 is an apocalyptic number.

138539671 is a deficient number, since it is larger than the sum of its proper divisors (1).

138539671 is an equidigital number, since it uses as much as digits as its factorization.

138539671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 138539671 is about 11770.2876345483. The cubic root of 138539671 is about 517.4376795670.

The spelling of 138539671 in words is "one hundred thirty-eight million, five hundred thirty-nine thousand, six hundred seventy-one".