1279696743121 has 4 divisors (see below), whose sum is σ = 1281764105200. Its totient is φ = 1277629381044.

The previous prime is 1279696743077. The next prime is 1279696743139. The reversal of 1279696743121 is 1213476969721.

It is a happy number.

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 not a de Polignac number, because 1279696743121 - 2¹⁹ = 1279696218833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1279696743181) 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, 1033680111 + ... + 1033681348.

It is an arithmetic number, because the mean of its divisors is an integer number (320441026300).

Almost surely, 2^{1279696743121} is an apocalyptic number.

It is an amenable number.

1279696743121 is a deficient number, since it is larger than the sum of its proper divisors (2067362079).

1279696743121 is an equidigital number, since it uses as much as digits as its factorization.

1279696743121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067362078.

The product of its digits is 6858432, while the sum is 58.

The spelling of 1279696743121 in words is "one trillion, two hundred seventy-nine billion, six hundred ninety-six million, seven hundred forty-three thousand, one hundred twenty-one".