138286717 has 2 divisors, whose sum is σ = 138286718. Its totient is φ = 138286716.

The previous prime is 138286697. The next prime is 138286739. The reversal of 138286717 is 717682831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77898276 + 60388441 = 8826^2 + 7771^2 .

It is an emirp because it is prime and its reverse (717682831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138286717 - 2²⁷ = 4068989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138287717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69143358 + 69143359.

It is an arithmetic number, because the mean of its divisors is an integer number (69143359).

Almost surely, 2^138286717 is an apocalyptic number.

It is an amenable number.

138286717 is a deficient number, since it is larger than the sum of its proper divisors (1).

138286717 is an equidigital number, since it uses as much as digits as its factorization.

138286717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 43.

The square root of 138286717 is about 11759.5372783116. The cubic root of 138286717 is about 517.1225648378.

The spelling of 138286717 in words is "one hundred thirty-eight million, two hundred eighty-six thousand, seven hundred seventeen".