243022213 has 6 divisors (see below), whose sum is σ = 282699366. Its totient is φ = 208304712.

The previous prime is 243022201. The next prime is 243022229. The reversal of 243022213 is 312220342.

It can be written as a sum of positive squares in only one way, i.e., 190937124 + 52085089 = 13818^2 + 7217^2 .

It is not a de Polignac number, because 243022213 - 2⁵ = 243022181 is a prime.

It is a super-2 number, since 2×243022213² = 118119592022834738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243022313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2479770 + ... + 2479867.

It is an arithmetic number, because the mean of its divisors is an integer number (47116561).

Almost surely, 2^243022213 is an apocalyptic number.

It is an amenable number.

243022213 is a deficient number, since it is larger than the sum of its proper divisors (39677153).

243022213 is an equidigital number, since it uses as much as digits as its factorization.

243022213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4959651 (or 4959644 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 243022213 is about 15589.1697341456. The cubic root of 243022213 is about 624.0441606992.

Adding to 243022213 its reverse (312220342), we get a palindrome (555242555).

The spelling of 243022213 in words is "two hundred forty-three million, twenty-two thousand, two hundred thirteen".