1287694252289 has 2 divisors, whose sum is σ = 1287694252290. Its totient is φ = 1287694252288.

The previous prime is 1287694252253. The next prime is 1287694252297. The reversal of 1287694252289 is 9822524967821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 945966321664 + 341727930625 = 972608^2 + 584575^2 .

It is an emirp because it is prime and its reverse (9822524967821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1287694252289 is a prime.

It is not a weakly prime, because it can be changed into another prime (1287694252249) 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, 643847126144 + 643847126145.

It is an arithmetic number, because the mean of its divisors is an integer number (643847126145).

Almost surely, 2^{1287694252289} is an apocalyptic number.

It is an amenable number.

1287694252289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287694252289 is an equidigital number, since it uses as much as digits as its factorization.

1287694252289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69672960, while the sum is 65.

The spelling of 1287694252289 in words is "one trillion, two hundred eighty-seven billion, six hundred ninety-four million, two hundred fifty-two thousand, two hundred eighty-nine".