1279982340209 has 4 divisors (see below), whose sum is σ = 1280486471280. Its totient is φ = 1279478209140.

The previous prime is 1279982340199. The next prime is 1279982340227. The reversal of 1279982340209 is 9020432899721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279982340209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279982340269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252061727 + ... + 252066804.

It is an arithmetic number, because the mean of its divisors is an integer number (320121617820).

Almost surely, 2^{1279982340209} is an apocalyptic number.

It is an amenable number.

1279982340209 is a deficient number, since it is larger than the sum of its proper divisors (504131071).

1279982340209 is an equidigital number, since it uses as much as digits as its factorization.

1279982340209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504131070.

The product of its (nonzero) digits is 3919104, while the sum is 56.

The spelling of 1279982340209 in words is "one trillion, two hundred seventy-nine billion, nine hundred eighty-two million, three hundred forty thousand, two hundred nine".