193217107890809 has 2 divisors, whose sum is σ = 193217107890810. Its totient is φ = 193217107890808.

The previous prime is 193217107890787. The next prime is 193217107890857. The reversal of 193217107890809 is 908098701712391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183589709022784 + 9627398868025 = 13549528^2 + 3102805^2 .

It is a cyclic number.

It is not a de Polignac number, because 193217107890809 - 2⁸ = 193217107890553 is a prime.

It is not a weakly prime, because it can be changed into another prime (193217107890899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96608553945404 + 96608553945405.

It is an arithmetic number, because the mean of its divisors is an integer number (96608553945405).

Almost surely, 2^{193217107890809} is an apocalyptic number.

It is an amenable number.

193217107890809 is a deficient number, since it is larger than the sum of its proper divisors (1).

193217107890809 is an equidigital number, since it uses as much as digits as its factorization.

193217107890809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13716864, while the sum is 65.

The spelling of 193217107890809 in words is "one hundred ninety-three trillion, two hundred seventeen billion, one hundred seven million, eight hundred ninety thousand, eight hundred nine".