1287816943493 has 2 divisors, whose sum is σ = 1287816943494. Its totient is φ = 1287816943492.

The previous prime is 1287816943459. The next prime is 1287816943579. The reversal of 1287816943493 is 3943496187821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1284362090209 + 3454853284 = 1133297^2 + 58778^2 .

It is a cyclic number.

It is not a de Polignac number, because 1287816943493 - 2³⁰ = 1286743201669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287816943423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643908471746 + 643908471747.

It is an arithmetic number, because the mean of its divisors is an integer number (643908471747).

Almost surely, 2^{1287816943493} is an apocalyptic number.

It is an amenable number.

1287816943493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287816943493 is an equidigital number, since it uses as much as digits as its factorization.

1287816943493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 65.

The spelling of 1287816943493 in words is "one trillion, two hundred eighty-seven billion, eight hundred sixteen million, nine hundred forty-three thousand, four hundred ninety-three".