138324621791 has 2 divisors, whose sum is σ = 138324621792. Its totient is φ = 138324621790.

The previous prime is 138324621781. The next prime is 138324621829. The reversal of 138324621791 is 197126423831.

138324621791 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 138324621791 - 2¹⁴ = 138324605407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138324621781) 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, 69162310895 + 69162310896.

It is an arithmetic number, because the mean of its divisors is an integer number (69162310896).

Almost surely, 2^138324621791 is an apocalyptic number.

138324621791 is a deficient number, since it is larger than the sum of its proper divisors (1).

138324621791 is an equidigital number, since it uses as much as digits as its factorization.

138324621791 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 138324621791 in words is "one hundred thirty-eight billion, three hundred twenty-four million, six hundred twenty-one thousand, seven hundred ninety-one".