1243705881589 has 2 divisors, whose sum is σ = 1243705881590. Its totient is φ = 1243705881588.

The previous prime is 1243705881569. The next prime is 1243705881599. The reversal of 1243705881589 is 9851885073421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1242685398564 + 1020483025 = 1114758^2 + 31945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243705881589 - 2¹¹ = 1243705879541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243705881569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621852940794 + 621852940795.

It is an arithmetic number, because the mean of its divisors is an integer number (621852940795).

Almost surely, 2^{1243705881589} is an apocalyptic number.

It is an amenable number.

1243705881589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243705881589 is an equidigital number, since it uses as much as digits as its factorization.

1243705881589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19353600, while the sum is 61.

The spelling of 1243705881589 in words is "one trillion, two hundred forty-three billion, seven hundred five million, eight hundred eighty-one thousand, five hundred eighty-nine".