216245 has 8 divisors (see below), whose sum is σ = 264120. Its totient is φ = 169920.

The previous prime is 216233. The next prime is 216259. The reversal of 216245 is 542612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7396 + 208849 = 86^2 + 457^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-216245 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50 + ... + 659.

It is an arithmetic number, because the mean of its divisors is an integer number (33015).

2²¹⁶²⁴⁵ is an apocalyptic number.

It is an amenable number.

216245 is a deficient number, since it is larger than the sum of its proper divisors (47875).

216245 is an equidigital number, since it uses as much as digits as its factorization.

216245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775.

The product of its digits is 480, while the sum is 20.

The square root of 216245 is about 465.0215048791. The cubic root of 216245 is about 60.0226766136.

Subtracting from 216245 its sum of digits (20), we obtain a square (216225 = 465²).

Adding to 216245 its reverse (542612), we get a palindrome (758857).

The spelling of 216245 in words is "two hundred sixteen thousand, two hundred forty-five".