1591289206489 has 2 divisors, whose sum is σ = 1591289206490. Its totient is φ = 1591289206488.

The previous prime is 1591289206363. The next prime is 1591289206601. The reversal of 1591289206489 is 9846029821951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1543942928025 + 47346278464 = 1242555^2 + 217592^2 .

It is a cyclic number.

It is not a de Polignac number, because 1591289206489 - 2³³ = 1582699271897 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1591289206489.

It is not a weakly prime, because it can be changed into another prime (1591289206289) 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, 795644603244 + 795644603245.

It is an arithmetic number, because the mean of its divisors is an integer number (795644603245).

Almost surely, 2^{1591289206489} is an apocalyptic number.

It is an amenable number.

1591289206489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1591289206489 is an equidigital number, since it uses as much as digits as its factorization.

1591289206489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22394880, while the sum is 64.

The spelling of 1591289206489 in words is "one trillion, five hundred ninety-one billion, two hundred eighty-nine million, two hundred six thousand, four hundred eighty-nine".