216169 has 4 divisors (see below), whose sum is σ = 218196. Its totient is φ = 214144.

The previous prime is 216157. The next prime is 216173. The reversal of 216169 is 961612.

216169 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82944 + 133225 = 288^2 + 365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216169 is a prime.

It is a super-2 number, since 2×216169² = 93458073122, 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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (216119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 844 + ... + 1069.

It is an arithmetic number, because the mean of its divisors is an integer number (54549).

2²¹⁶¹⁶⁹ is an apocalyptic number.

It is an amenable number.

216169 is a deficient number, since it is larger than the sum of its proper divisors (2027).

216169 is a wasteful number, since it uses less digits than its factorization.

216169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026.

The product of its digits is 648, while the sum is 25.

The square root of 216169 is about 464.9397810470. The cubic root of 216169 is about 60.0156440688.

The spelling of 216169 in words is "two hundred sixteen thousand, one hundred sixty-nine".