161717 has 2 divisors, whose sum is σ = 161718. Its totient is φ = 161716.

The previous prime is 161683. The next prime is 161729. The reversal of 161717 is 717161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 152881 + 8836 = 391^2 + 94^2 .

It is an emirp because it is prime and its reverse (717161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161717 - 2⁸ = 161461 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161692 and 161701.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161717.

It is not a weakly prime, because it can be changed into another prime (161017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80858 + 80859.

It is an arithmetic number, because the mean of its divisors is an integer number (80859).

2¹⁶¹⁷¹⁷ is an apocalyptic number.

It is an amenable number.

161717 is a deficient number, since it is larger than the sum of its proper divisors (1).

161717 is an equidigital number, since it uses as much as digits as its factorization.

161717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294, while the sum is 23.

The square root of 161717 is about 402.1405227032. The cubic root of 161717 is about 54.4818557562.

Adding to 161717 its reverse (717161), we get a palindrome (878878).

It can be divided in two parts, 161 and 717, that added together give a palindrome (878).

The spelling of 161717 in words is "one hundred sixty-one thousand, seven hundred seventeen".