138585571 has 2 divisors, whose sum is σ = 138585572. Its totient is φ = 138585570.

The previous prime is 138585541. The next prime is 138585607. The reversal of 138585571 is 175585831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138585571 - 2⁷ = 138585443 is a prime.

It is equal to p_7836694 and since 138585571 and 7836694 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (138585541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69292785 + 69292786.

It is an arithmetic number, because the mean of its divisors is an integer number (69292786).

Almost surely, 2^138585571 is an apocalyptic number.

138585571 is a deficient number, since it is larger than the sum of its proper divisors (1).

138585571 is an equidigital number, since it uses as much as digits as its factorization.

138585571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168000, while the sum is 43.

The square root of 138585571 is about 11772.2372979821. The cubic root of 138585571 is about 517.4948178746.

The spelling of 138585571 in words is "one hundred thirty-eight million, five hundred eighty-five thousand, five hundred seventy-one".