138953671 has 2 divisors, whose sum is σ = 138953672. Its totient is φ = 138953670.

The previous prime is 138953627. The next prime is 138953677. The reversal of 138953671 is 176359831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138953671 - 2⁹ = 138953159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138953677) 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, 69476835 + 69476836.

It is an arithmetic number, because the mean of its divisors is an integer number (69476836).

Almost surely, 2^138953671 is an apocalyptic number.

138953671 is a deficient number, since it is larger than the sum of its proper divisors (1).

138953671 is an equidigital number, since it uses as much as digits as its factorization.

138953671 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 138953671 is about 11787.8611715612. The cubic root of 138953671 is about 517.9525890429.

The spelling of 138953671 in words is "one hundred thirty-eight million, nine hundred fifty-three thousand, six hundred seventy-one".