222809 has 4 divisors (see below), whose sum is σ = 225204. Its totient is φ = 220416.

The previous prime is 222799. The next prime is 222823. The reversal of 222809 is 908222.

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 102400 + 120409 = 320^2 + 347^2 .

It is a cyclic number.

It is not a de Polignac number, because 222809 - 2⁴ = 222793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (222839) 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, 1052 + ... + 1245.

It is an arithmetic number, because the mean of its divisors is an integer number (56301).

2²²²⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

222809 is a deficient number, since it is larger than the sum of its proper divisors (2395).

222809 is an equidigital number, since it uses as much as digits as its factorization.

222809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 222809 is about 472.0264823079. The cubic root of 222809 is about 60.6239518719.

The spelling of 222809 in words is "two hundred twenty-two thousand, eight hundred nine".