138057006991 has 2 divisors, whose sum is σ = 138057006992. Its totient is φ = 138057006990.

The previous prime is 138057006979. The next prime is 138057007027. The reversal of 138057006991 is 199600750831.

It is a weak prime.

It is an emirp because it is prime and its reverse (199600750831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138057006991 - 2¹³ = 138056998799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138057006931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69028503495 + 69028503496.

It is an arithmetic number, because the mean of its divisors is an integer number (69028503496).

Almost surely, 2^138057006991 is an apocalyptic number.

138057006991 is a deficient number, since it is larger than the sum of its proper divisors (1).

138057006991 is an equidigital number, since it uses as much as digits as its factorization.

138057006991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 408240, while the sum is 49.

The spelling of 138057006991 in words is "one hundred thirty-eight billion, fifty-seven million, six thousand, nine hundred ninety-one".