161716 has 6 divisors (see below), whose sum is σ = 283010. Its totient is φ = 80856.

The previous prime is 161683. The next prime is 161717. The reversal of 161716 is 617161.

It can be written as a sum of positive squares in only one way, i.e., 156816 + 4900 = 396^2 + 70^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161717) by changing a digit.

161716 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20211 + ... + 20218.

2¹⁶¹⁷¹⁶ is an apocalyptic number.

It is an amenable number.

161716 is a deficient number, since it is larger than the sum of its proper divisors (121294).

161716 is a wasteful number, since it uses less digits than its factorization.

161716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40433 (or 40431 counting only the distinct ones).

The product of its digits is 252, while the sum is 22.

The square root of 161716 is about 402.1392793548. The cubic root of 161716 is about 54.4817434572.

Adding to 161716 its reverse (617161), we get a palindrome (778877).

The spelling of 161716 in words is "one hundred sixty-one thousand, seven hundred sixteen".