1279445617789 has 8 divisors (see below), whose sum is σ = 1306697344128. Its totient is φ = 1252195119840.

The previous prime is 1279445617781. The next prime is 1279445617829. The reversal of 1279445617789 is 9877165449721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1279445617789 - 2³ = 1279445617781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279445617781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1977249 + ... + 2543305.

It is an arithmetic number, because the mean of its divisors is an integer number (163337168016).

Almost surely, 2^{1279445617789} is an apocalyptic number.

It is an amenable number.

1279445617789 is a deficient number, since it is larger than the sum of its proper divisors (27251726339).

1279445617789 is an equidigital number, since it uses as much as digits as its factorization.

1279445617789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614195.

The product of its digits is 213373440, while the sum is 70.

The spelling of 1279445617789 in words is "one trillion, two hundred seventy-nine billion, four hundred forty-five million, six hundred seventeen thousand, seven hundred eighty-nine".