138691716937 has 2 divisors, whose sum is σ = 138691716938. Its totient is φ = 138691716936.

The previous prime is 138691716907. The next prime is 138691716991. The reversal of 138691716937 is 739617196831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115558523721 + 23133193216 = 339939^2 + 152096^2 .

It is an emirp because it is prime and its reverse (739617196831) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138691716937 is a prime.

It is not a weakly prime, because it can be changed into another prime (138691716907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69345858468 + 69345858469.

It is an arithmetic number, because the mean of its divisors is an integer number (69345858469).

Almost surely, 2^138691716937 is an apocalyptic number.

It is an amenable number.

138691716937 is a deficient number, since it is larger than the sum of its proper divisors (1).

138691716937 is an equidigital number, since it uses as much as digits as its factorization.

138691716937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 61.

The spelling of 138691716937 in words is "one hundred thirty-eight billion, six hundred ninety-one million, seven hundred sixteen thousand, nine hundred thirty-seven".