17131320209 has 2 divisors, whose sum is σ = 17131320210. Its totient is φ = 17131320208.

The previous prime is 17131320203. The next prime is 17131320229. The reversal of 17131320209 is 90202313171.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16165851025 + 965469184 = 127145^2 + 31072^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17131320209 is a prime.

It is not a weakly prime, because it can be changed into another prime (17131320203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8565660104 + 8565660105.

It is an arithmetic number, because the mean of its divisors is an integer number (8565660105).

Almost surely, 2^17131320209 is an apocalyptic number.

It is an amenable number.

17131320209 is a deficient number, since it is larger than the sum of its proper divisors (1).

17131320209 is an equidigital number, since it uses as much as digits as its factorization.

17131320209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The spelling of 17131320209 in words is "seventeen billion, one hundred thirty-one million, three hundred twenty thousand, two hundred nine".