138931061447 has 2 divisors, whose sum is σ = 138931061448. Its totient is φ = 138931061446.

The previous prime is 138931061417. The next prime is 138931061491. The reversal of 138931061447 is 744160139831.

138931061447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138931061447 - 2²² = 138926867143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138931061407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69465530723 + 69465530724.

It is an arithmetic number, because the mean of its divisors is an integer number (69465530724).

Almost surely, 2^138931061447 is an apocalyptic number.

138931061447 is a deficient number, since it is larger than the sum of its proper divisors (1).

138931061447 is an equidigital number, since it uses as much as digits as its factorization.

138931061447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 138931061447 in words is "one hundred thirty-eight billion, nine hundred thirty-one million, sixty-one thousand, four hundred forty-seven".