138557071 has 2 divisors, whose sum is σ = 138557072. Its totient is φ = 138557070.

The previous prime is 138557039. The next prime is 138557077. The reversal of 138557071 is 170755831.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 138557071 - 2⁵ = 138557039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138557071.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138557077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69278535 + 69278536.

It is an arithmetic number, because the mean of its divisors is an integer number (69278536).

Almost surely, 2^138557071 is an apocalyptic number.

138557071 is a deficient number, since it is larger than the sum of its proper divisors (1).

138557071 is an equidigital number, since it uses as much as digits as its factorization.

138557071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29400, while the sum is 37.

The square root of 138557071 is about 11771.0267606526. The cubic root of 138557071 is about 517.4593413255.

The spelling of 138557071 in words is "one hundred thirty-eight million, five hundred fifty-seven thousand, seventy-one".