1687593341281 has 2 divisors, whose sum is σ = 1687593341282. Its totient is φ = 1687593341280.

The previous prime is 1687593341261. The next prime is 1687593341303. The reversal of 1687593341281 is 1821433957861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1673853750625 + 13739590656 = 1293775^2 + 117216^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687593341281 - 2¹¹ = 1687593339233 is a prime.

It is a super-2 number, since 2×1687593341281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1687593341261) 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, 843796670640 + 843796670641.

It is an arithmetic number, because the mean of its divisors is an integer number (843796670641).

Almost surely, 2^{1687593341281} is an apocalyptic number.

It is an amenable number.

1687593341281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687593341281 is an equidigital number, since it uses as much as digits as its factorization.

1687593341281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8709120, while the sum is 58.

The spelling of 1687593341281 in words is "one trillion, six hundred eighty-seven billion, five hundred ninety-three million, three hundred forty-one thousand, two hundred eighty-one".