17943728317 has 2 divisors, whose sum is σ = 17943728318. Its totient is φ = 17943728316.

The previous prime is 17943728261. The next prime is 17943728321. The reversal of 17943728317 is 71382734971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16354828996 + 1588899321 = 127886^2 + 39861^2 .

It is an emirp because it is prime and its reverse (71382734971) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17943728317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17943728017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8971864158 + 8971864159.

It is an arithmetic number, because the mean of its divisors is an integer number (8971864159).

Almost surely, 2^17943728317 is an apocalyptic number.

It is an amenable number.

17943728317 is a deficient number, since it is larger than the sum of its proper divisors (1).

17943728317 is an equidigital number, since it uses as much as digits as its factorization.

17943728317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1778112, while the sum is 52.

The spelling of 17943728317 in words is "seventeen billion, nine hundred forty-three million, seven hundred twenty-eight thousand, three hundred seventeen".