138481771 has 2 divisors, whose sum is σ = 138481772. Its totient is φ = 138481770.

The previous prime is 138481753. The next prime is 138481789. The reversal of 138481771 is 177184831.

It is a balanced prime because it is at equal distance from previous prime (138481753) and next prime (138481789).

It is a cyclic number.

It is not a de Polignac number, because 138481771 - 2¹⁹ = 137957483 is a prime.

It is not a weakly prime, because it can be changed into another prime (138485771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69240885 + 69240886.

It is an arithmetic number, because the mean of its divisors is an integer number (69240886).

Almost surely, 2^138481771 is an apocalyptic number.

138481771 is a deficient number, since it is larger than the sum of its proper divisors (1).

138481771 is an equidigital number, since it uses as much as digits as its factorization.

138481771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37632, while the sum is 40.

The square root of 138481771 is about 11767.8277944572. The cubic root of 138481771 is about 517.3655851358.

The spelling of 138481771 in words is "one hundred thirty-eight million, four hundred eighty-one thousand, seven hundred seventy-one".