1173395061809 has 2 divisors, whose sum is σ = 1173395061810. Its totient is φ = 1173395061808.

The previous prime is 1173395061767. The next prime is 1173395061889. The reversal of 1173395061809 is 9081605933711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1148122965025 + 25272096784 = 1071505^2 + 158972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1173395061809 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 (1173395061889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 586697530904 + 586697530905.

It is an arithmetic number, because the mean of its divisors is an integer number (586697530905).

Almost surely, 2^{1173395061809} is an apocalyptic number.

It is an amenable number.

1173395061809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1173395061809 is an equidigital number, since it uses as much as digits as its factorization.

1173395061809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The spelling of 1173395061809 in words is "one trillion, one hundred seventy-three billion, three hundred ninety-five million, sixty-one thousand, eight hundred nine".