18705317 has 2 divisors, whose sum is σ = 18705318. Its totient is φ = 18705316.

The previous prime is 18705293. The next prime is 18705341. The reversal of 18705317 is 71350781.

It is a balanced prime because it is at equal distance from previous prime (18705293) and next prime (18705341).

It can be written as a sum of positive squares in only one way, i.e., 10588516 + 8116801 = 3254^2 + 2849^2 .

It is an emirp because it is prime and its reverse (71350781) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18705317 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18705217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9352658 + 9352659.

It is an arithmetic number, because the mean of its divisors is an integer number (9352659).

Almost surely, 2^18705317 is an apocalyptic number.

It is an amenable number.

18705317 is a deficient number, since it is larger than the sum of its proper divisors (1).

18705317 is an equidigital number, since it uses as much as digits as its factorization.

18705317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 18705317 is about 4324.9643929170. The cubic root of 18705317 is about 265.4534398890.

The spelling of 18705317 in words is "eighteen million, seven hundred five thousand, three hundred seventeen".