1989365387329 has 2 divisors, whose sum is σ = 1989365387330. Its totient is φ = 1989365387328.

The previous prime is 1989365387299. The next prime is 1989365387351. The reversal of 1989365387329 is 9237835639891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1964818958400 + 24546428929 = 1401720^2 + 156673^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989365387329 - 2¹⁹ = 1989364863041 is a prime.

It is not a weakly prime, because it can be changed into another prime (1989365337329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994682693664 + 994682693665.

It is an arithmetic number, because the mean of its divisors is an integer number (994682693665).

Almost surely, 2^{1989365387329} is an apocalyptic number.

It is an amenable number.

1989365387329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989365387329 is an equidigital number, since it uses as much as digits as its factorization.

1989365387329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 529079040, while the sum is 73.

The spelling of 1989365387329 in words is "one trillion, nine hundred eighty-nine billion, three hundred sixty-five million, three hundred eighty-seven thousand, three hundred twenty-nine".