1279727972351 has 4 divisors (see below), whose sum is σ = 1279736742600. Its totient is φ = 1279719202104.

The previous prime is 1279727972273. The next prime is 1279727972401. The reversal of 1279727972351 is 1532797279721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1279727972351 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 (1279727972951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4162481 + ... + 4459338.

It is an arithmetic number, because the mean of its divisors is an integer number (319934185650).

Almost surely, 2^{1279727972351} is an apocalyptic number.

1279727972351 is a deficient number, since it is larger than the sum of its proper divisors (8770249).

1279727972351 is an equidigital number, since it uses as much as digits as its factorization.

1279727972351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8770248.

The product of its digits is 23337720, while the sum is 62.

The spelling of 1279727972351 in words is "one trillion, two hundred seventy-nine billion, seven hundred twenty-seven million, nine hundred seventy-two thousand, three hundred fifty-one".