216055 has 8 divisors (see below), whose sum is σ = 296352. Its totient is φ = 148128.

The previous prime is 216037. The next prime is 216061. The reversal of 216055 is 550612.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 216055 - 2⁵ = 216023 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3052 + ... + 3121.

It is an arithmetic number, because the mean of its divisors is an integer number (37044).

216055 is a Friedman number, since it can be written as 60^(2+1)+55, using all its digits and the basic arithmetic operations.

2²¹⁶⁰⁵⁵ is an apocalyptic number.

216055 is a deficient number, since it is larger than the sum of its proper divisors (80297).

216055 is an equidigital number, since it uses as much as digits as its factorization.

216055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6185.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 216055 is about 464.8171683576. The cubic root of 216055 is about 60.0050921604.

Adding to 216055 its reverse (550612), we get a palindrome (766667).

The spelling of 216055 in words is "two hundred sixteen thousand, fifty-five".