1279389173899 has 2 divisors, whose sum is σ = 1279389173900. Its totient is φ = 1279389173898.

The previous prime is 1279389173863. The next prime is 1279389173939. The reversal of 1279389173899 is 9983719839721.

It is a weak prime.

It is an emirp because it is prime and its reverse (9983719839721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1279389173899 - 2⁷ = 1279389173771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279389173299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639694586949 + 639694586950.

It is an arithmetic number, because the mean of its divisors is an integer number (639694586950).

Almost surely, 2^{1279389173899} is an apocalyptic number.

1279389173899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279389173899 is an equidigital number, since it uses as much as digits as its factorization.

1279389173899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 370355328, while the sum is 76.

The spelling of 1279389173899 in words is "one trillion, two hundred seventy-nine billion, three hundred eighty-nine million, one hundred seventy-three thousand, eight hundred ninety-nine".