161218 has 8 divisors (see below), whose sum is σ = 243900. Its totient is φ = 79920.

The previous prime is 161201. The next prime is 161221. The reversal of 161218 is 812161.

161218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 149769 + 11449 = 387^2 + 107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 = 161195 and 161204.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28 + ... + 568.

2¹⁶¹²¹⁸ is an apocalyptic number.

161218 is a deficient number, since it is larger than the sum of its proper divisors (82682).

161218 is a wasteful number, since it uses less digits than its factorization.

161218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692.

The product of its digits is 96, while the sum is 19.

The square root of 161218 is about 401.5196134686. The cubic root of 161218 is about 54.4257609392.

Adding to 161218 its reverse (812161), we get a palindrome (973379).

It can be divided in two parts, 16121 and 8, that added together give a square (16129 = 127²).

The spelling of 161218 in words is "one hundred sixty-one thousand, two hundred eighteen".