1271781793651 has 2 divisors, whose sum is σ = 1271781793652. Its totient is φ = 1271781793650.

The previous prime is 1271781793613. The next prime is 1271781793741. The reversal of 1271781793651 is 1563971871721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1271781793651 - 2¹¹ = 1271781791603 is a prime.

It is not a weakly prime, because it can be changed into another prime (1271781713651) 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 as a sum of consecutive naturals, namely, 635890896825 + 635890896826.

It is an arithmetic number, because the mean of its divisors is an integer number (635890896826).

Almost surely, 2^{1271781793651} is an apocalyptic number.

1271781793651 is a deficient number, since it is larger than the sum of its proper divisors (1).

1271781793651 is an equidigital number, since it uses as much as digits as its factorization.

1271781793651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4445280, while the sum is 58.

The spelling of 1271781793651 in words is "one trillion, two hundred seventy-one billion, seven hundred eighty-one million, seven hundred ninety-three thousand, six hundred fifty-one".