138568571 has 2 divisors, whose sum is σ = 138568572. Its totient is φ = 138568570.

The previous prime is 138568541. The next prime is 138568579. The reversal of 138568571 is 175865831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138568571 - 2²² = 134374267 is a prime.

It is not a weakly prime, because it can be changed into another prime (138568579) 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, 69284285 + 69284286.

It is an arithmetic number, because the mean of its divisors is an integer number (69284286).

Almost surely, 2^138568571 is an apocalyptic number.

138568571 is a deficient number, since it is larger than the sum of its proper divisors (1).

138568571 is an equidigital number, since it uses as much as digits as its factorization.

138568571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 44.

The square root of 138568571 is about 11771.5152380651. The cubic root of 138568571 is about 517.4736570097.

The spelling of 138568571 in words is "one hundred thirty-eight million, five hundred sixty-eight thousand, five hundred seventy-one".