1797904538009 has 2 divisors, whose sum is σ = 1797904538010. Its totient is φ = 1797904538008.

The previous prime is 1797904537997. The next prime is 1797904538047. The reversal of 1797904538009 is 9008354097971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1359898825609 + 438005712400 = 1166147^2 + 661820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1797904538009 - 2⁴⁰ = 698392910233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1797904538099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 898952269004 + 898952269005.

It is an arithmetic number, because the mean of its divisors is an integer number (898952269005).

Almost surely, 2^{1797904538009} is an apocalyptic number.

It is an amenable number.

1797904538009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1797904538009 is an equidigital number, since it uses as much as digits as its factorization.

1797904538009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 62.

The spelling of 1797904538009 in words is "one trillion, seven hundred ninety-seven billion, nine hundred four million, five hundred thirty-eight thousand, nine".