1291813030769 has 2 divisors, whose sum is σ = 1291813030770. Its totient is φ = 1291813030768.

The previous prime is 1291813030733. The next prime is 1291813030813. The reversal of 1291813030769 is 9670303181921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000024000144 + 291789030625 = 1000012^2 + 540175^2 .

It is an emirp because it is prime and its reverse (9670303181921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291813030769 - 2³² = 1287518063473 is a prime.

It is a super-2 number, since 2×1291813030769² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1291813030169) 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, 645906515384 + 645906515385.

It is an arithmetic number, because the mean of its divisors is an integer number (645906515385).

Almost surely, 2^{1291813030769} is an apocalyptic number.

It is an amenable number.

1291813030769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291813030769 is an equidigital number, since it uses as much as digits as its factorization.

1291813030769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 1291813030769 in words is "one trillion, two hundred ninety-one billion, eight hundred thirteen million, thirty thousand, seven hundred sixty-nine".