161716717 has 2 divisors, whose sum is σ = 161716718. Its totient is φ = 161716716.

The previous prime is 161716691. The next prime is 161716729. The reversal of 161716717 is 717617161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122014116 + 39702601 = 11046^2 + 6301^2 .

It is an emirp because it is prime and its reverse (717617161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161716717 - 2⁷ = 161716589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161716787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80858358 + 80858359.

It is an arithmetic number, because the mean of its divisors is an integer number (80858359).

Almost surely, 2^161716717 is an apocalyptic number.

It is an amenable number.

161716717 is a deficient number, since it is larger than the sum of its proper divisors (1).

161716717 is an equidigital number, since it uses as much as digits as its factorization.

161716717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12348, while the sum is 37.

The square root of 161716717 is about 12716.7887849095. The cubic root of 161716717 is about 544.8182397563.

The spelling of 161716717 in words is "one hundred sixty-one million, seven hundred sixteen thousand, seven hundred seventeen".