138466571 has 2 divisors, whose sum is σ = 138466572. Its totient is φ = 138466570.

The previous prime is 138466519. The next prime is 138466583. The reversal of 138466571 is 175664831.

It is a strong prime.

It is an emirp because it is prime and its reverse (175664831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138466571 - 2⁶ = 138466507 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (138466771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69233285 + 69233286.

It is an arithmetic number, because the mean of its divisors is an integer number (69233286).

Almost surely, 2^138466571 is an apocalyptic number.

138466571 is a deficient number, since it is larger than the sum of its proper divisors (1).

138466571 is an equidigital number, since it uses as much as digits as its factorization.

138466571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 138466571 is about 11767.1819481132. The cubic root of 138466571 is about 517.3466554611.

The spelling of 138466571 in words is "one hundred thirty-eight million, four hundred sixty-six thousand, five hundred seventy-one".