161217 has 16 divisors (see below), whose sum is σ = 273280. Its totient is φ = 92016.

The previous prime is 161201. The next prime is 161221. The reversal of 161217 is 712161.

161217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161217 - 2⁴ = 161201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161217.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 161217.

It is not an unprimeable number, because it can be changed into a prime (161237) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238 + ... + 615.

It is an arithmetic number, because the mean of its divisors is an integer number (17080).

2¹⁶¹²¹⁷ is an apocalyptic number.

It is an amenable number.

161217 is a deficient number, since it is larger than the sum of its proper divisors (112063).

161217 is an equidigital number, since it uses as much as digits as its factorization.

161217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 863 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 161217 is about 401.5183681975. The cubic root of 161217 is about 54.4256484086.

Adding to 161217 its reverse (712161), we get a palindrome (873378).

It can be divided in two parts, 161 and 217, that added together give a triangular number (378 = T₂₇).

The spelling of 161217 in words is "one hundred sixty-one thousand, two hundred seventeen".