1279956993517 has 8 divisors (see below), whose sum is σ = 1295899932600. Its totient is φ = 1264048752384.

The previous prime is 1279956993451. The next prime is 1279956993521. The reversal of 1279956993517 is 7153996599721.

It can be written as a sum of positive squares in 4 ways, for example, as 134556178761 + 1145400814756 = 366819^2 + 1070234^2 .

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 1279956993517 - 2⁷ = 1279956993389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1279956993517.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279956990517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8600248 + ... + 8747809.

It is an arithmetic number, because the mean of its divisors is an integer number (161987491575).

Almost surely, 2^{1279956993517} is an apocalyptic number.

It is an amenable number.

1279956993517 is a deficient number, since it is larger than the sum of its proper divisors (15942939083).

1279956993517 is an equidigital number, since it uses as much as digits as its factorization.

1279956993517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17348975.

The product of its digits is 289340100, while the sum is 73.

The spelling of 1279956993517 in words is "one trillion, two hundred seventy-nine billion, nine hundred fifty-six million, nine hundred ninety-three thousand, five hundred seventeen".