138831272947 has 2 divisors, whose sum is σ = 138831272948. Its totient is φ = 138831272946.

The previous prime is 138831272941. The next prime is 138831272971. The reversal of 138831272947 is 749272138831.

It is a weak prime.

It is an emirp because it is prime and its reverse (749272138831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138831272947 - 2¹⁵ = 138831240179 is a prime.

It is not a weakly prime, because it can be changed into another prime (138831272941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69415636473 + 69415636474.

It is an arithmetic number, because the mean of its divisors is an integer number (69415636474).

Almost surely, 2^138831272947 is an apocalyptic number.

138831272947 is a deficient number, since it is larger than the sum of its proper divisors (1).

138831272947 is an equidigital number, since it uses as much as digits as its factorization.

138831272947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 55.

It can be divided in two parts, 138831 and 272947, that added together give a triangular number (411778 = T₉₀₇).

The spelling of 138831272947 in words is "one hundred thirty-eight billion, eight hundred thirty-one million, two hundred seventy-two thousand, nine hundred forty-seven".