138780071 has 2 divisors, whose sum is σ = 138780072. Its totient is φ = 138780070.

The previous prime is 138779983. The next prime is 138780077. The reversal of 138780071 is 170087831.

138780071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (170087831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138780071 - 2¹⁸ = 138517927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138780077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69390035 + 69390036.

It is an arithmetic number, because the mean of its divisors is an integer number (69390036).

Almost surely, 2^138780071 is an apocalyptic number.

138780071 is a deficient number, since it is larger than the sum of its proper divisors (1).

138780071 is an equidigital number, since it uses as much as digits as its factorization.

138780071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9408, while the sum is 35.

The square root of 138780071 is about 11780.4953630991. The cubic root of 138780071 is about 517.7367999956.

The spelling of 138780071 in words is "one hundred thirty-eight million, seven hundred eighty thousand, seventy-one".