1042721775709 has 2 divisors, whose sum is σ = 1042721775710. Its totient is φ = 1042721775708.

The previous prime is 1042721775653. The next prime is 1042721775749. The reversal of 1042721775709 is 9075771272401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 559536912484 + 483184863225 = 748022^2 + 695115^2 .

It is an emirp because it is prime and its reverse (9075771272401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1042721775709 - 2⁹ = 1042721775197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1042721775749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521360887854 + 521360887855.

It is an arithmetic number, because the mean of its divisors is an integer number (521360887855).

Almost surely, 2^{1042721775709} is an apocalyptic number.

It is an amenable number.

1042721775709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042721775709 is an equidigital number, since it uses as much as digits as its factorization.

1042721775709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728720, while the sum is 52.

The spelling of 1042721775709 in words is "one trillion, forty-two billion, seven hundred twenty-one million, seven hundred seventy-five thousand, seven hundred nine".