138318784271 has 2 divisors, whose sum is σ = 138318784272. Its totient is φ = 138318784270.

The previous prime is 138318784267. The next prime is 138318784319. The reversal of 138318784271 is 172487813831.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138318784271 - 2² = 138318784267 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138318784211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69159392135 + 69159392136.

It is an arithmetic number, because the mean of its divisors is an integer number (69159392136).

Almost surely, 2^138318784271 is an apocalyptic number.

138318784271 is a deficient number, since it is larger than the sum of its proper divisors (1).

138318784271 is an equidigital number, since it uses as much as digits as its factorization.

138318784271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1806336, while the sum is 53.

The spelling of 138318784271 in words is "one hundred thirty-eight billion, three hundred eighteen million, seven hundred eighty-four thousand, two hundred seventy-one".