1291243180673 has 2 divisors, whose sum is σ = 1291243180674. Its totient is φ = 1291243180672.

The previous prime is 1291243180547. The next prime is 1291243180679. The reversal of 1291243180673 is 3760813421921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1288206840064 + 3036340609 = 1134992^2 + 55103^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291243180673 - 2¹² = 1291243176577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291243180679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645621590336 + 645621590337.

It is an arithmetic number, because the mean of its divisors is an integer number (645621590337).

Almost surely, 2^{1291243180673} is an apocalyptic number.

It is an amenable number.

1291243180673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291243180673 is an equidigital number, since it uses as much as digits as its factorization.

1291243180673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 1291243180673 in words is "one trillion, two hundred ninety-one billion, two hundred forty-three million, one hundred eighty thousand, six hundred seventy-three".