138575771 has 2 divisors, whose sum is σ = 138575772. Its totient is φ = 138575770.

The previous prime is 138575729. The next prime is 138575831. The reversal of 138575771 is 177575831.

It is a weak prime.

It is an emirp because it is prime and its reverse (177575831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138575771 - 2¹⁸ = 138313627 is a prime.

It is not a weakly prime, because it can be changed into another prime (138575711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69287885 + 69287886.

It is an arithmetic number, because the mean of its divisors is an integer number (69287886).

Almost surely, 2^138575771 is an apocalyptic number.

138575771 is a deficient number, since it is larger than the sum of its proper divisors (1).

138575771 is an equidigital number, since it uses as much as digits as its factorization.

138575771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 205800, while the sum is 44.

The square root of 138575771 is about 11771.8210570837. The cubic root of 138575771 is about 517.4826194696.

The spelling of 138575771 in words is "one hundred thirty-eight million, five hundred seventy-five thousand, seven hundred seventy-one".