216269 has 4 divisors (see below), whose sum is σ = 225696. Its totient is φ = 206844.

The previous prime is 216263. The next prime is 216289. The reversal of 216269 is 962612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216269 is a prime.

It is a super-2 number, since 2×216269² = 93544560722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216269.

It is not an unprimeable number, because it can be changed into a prime (216263) 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, 4679 + ... + 4724.

It is an arithmetic number, because the mean of its divisors is an integer number (56424).

2²¹⁶²⁶⁹ is an apocalyptic number.

It is an amenable number.

216269 is a deficient number, since it is larger than the sum of its proper divisors (9427).

216269 is an equidigital number, since it uses as much as digits as its factorization.

216269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9426.

The product of its digits is 1296, while the sum is 26.

The square root of 216269 is about 465.0473094213. The cubic root of 216269 is about 60.0248970749.

The spelling of 216269 in words is "two hundred sixteen thousand, two hundred sixty-nine".