218169 has 12 divisors (see below), whose sum is σ = 360256. Its totient is φ = 124632.

The previous prime is 218149. The next prime is 218171. The reversal of 218169 is 961812.

218169 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 218169 - 2⁵ = 218137 is a prime.

It is a super-2 number, since 2×218169² = 95195425122, which contains 22 as substring.

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

It is a Duffinian number.

It is a plaindrome in base 15.

It is a zygodrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (218149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1669 + ... + 1794.

2²¹⁸¹⁶⁹ is an apocalyptic number.

It is an amenable number.

218169 is a deficient number, since it is larger than the sum of its proper divisors (142087).

218169 is a wasteful number, since it uses less digits than its factorization.

218169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3476 (or 3473 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 218169 is about 467.0856452515. The cubic root of 218169 is about 60.2001648248.

The spelling of 218169 in words is "two hundred eighteen thousand, one hundred sixty-nine".