216193 has 4 divisors (see below), whose sum is σ = 221508. Its totient is φ = 210880.

The previous prime is 216179. The next prime is 216211. The reversal of 216193 is 391612.

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 49729 + 166464 = 223^2 + 408^2 .

It is a cyclic number.

It is not a de Polignac number, because 216193 - 2⁹ = 215681 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (216103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2596 + ... + 2677.

It is an arithmetic number, because the mean of its divisors is an integer number (55377).

2²¹⁶¹⁹³ is an apocalyptic number.

It is an amenable number.

216193 is a deficient number, since it is larger than the sum of its proper divisors (5315).

216193 is an equidigital number, since it uses as much as digits as its factorization.

216193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5314.

The product of its digits is 324, while the sum is 22.

The square root of 216193 is about 464.9655901247. The cubic root of 216193 is about 60.0178650505.

The spelling of 216193 in words is "two hundred sixteen thousand, one hundred ninety-three".