161216 has 28 divisors (see below), whose sum is σ = 350520. Its totient is φ = 72960.

The previous prime is 161201. The next prime is 161221. The reversal of 161216 is 612161.

It is a happy number.

It is a hoax number, since the sum of its digits (17) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 161194 and 161203.

It is a congruent number.

It is an unprimeable number.

161216 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590 + ... + 818.

2¹⁶¹²¹⁶ is an apocalyptic number.

161216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175260).

161216 is an abundant number, since it is smaller than the sum of its proper divisors (189304).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161216 is a wasteful number, since it uses less digits than its factorization.

161216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252 (or 242 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 161216 is about 401.5171229225. The cubic root of 161216 is about 54.4255358775.

Adding to 161216 its reverse (612161), we get a palindrome (773377).

The spelling of 161216 in words is "one hundred sixty-one thousand, two hundred sixteen".