1239338722691 has 2 divisors, whose sum is σ = 1239338722692. Its totient is φ = 1239338722690.

The previous prime is 1239338722679. The next prime is 1239338722697. The reversal of 1239338722691 is 1962278339321.

It is a strong prime.

It is an emirp because it is prime and its reverse (1962278339321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1239338722691 is a prime.

It is a super-2 number, since 2×1239338722691² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1239338722697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 619669361345 + 619669361346.

It is an arithmetic number, because the mean of its divisors is an integer number (619669361346).

Almost surely, 2^{1239338722691} is an apocalyptic number.

1239338722691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1239338722691 is an equidigital number, since it uses as much as digits as its factorization.

1239338722691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 56.

The spelling of 1239338722691 in words is "one trillion, two hundred thirty-nine billion, three hundred thirty-eight million, seven hundred twenty-two thousand, six hundred ninety-one".