1019944891709 has 2 divisors, whose sum is σ = 1019944891710. Its totient is φ = 1019944891708.

The previous prime is 1019944891699. The next prime is 1019944891747. The reversal of 1019944891709 is 9071984499101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 596115247225 + 423829644484 = 772085^2 + 651022^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1019944891709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019944891759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509972445854 + 509972445855.

It is an arithmetic number, because the mean of its divisors is an integer number (509972445855).

Almost surely, 2^{1019944891709} is an apocalyptic number.

It is an amenable number.

1019944891709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019944891709 is an equidigital number, since it uses as much as digits as its factorization.

1019944891709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 62.

The spelling of 1019944891709 in words is "one trillion, nineteen billion, nine hundred forty-four million, eight hundred ninety-one thousand, seven hundred nine".