243231213 has 8 divisors (see below), whose sum is σ = 324626368. Its totient is φ = 161995104.

The previous prime is 243231199. The next prime is 243231221. The reversal of 243231213 is 312132342.

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

It is not a de Polignac number, because 243231213 - 2¹³ = 243223021 is a prime.

It is a super-2 number, since 2×243231213² = 118322845954902738, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243231213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243231113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36145 + ... + 42342.

It is an arithmetic number, because the mean of its divisors is an integer number (40578296).

Almost surely, 2^243231213 is an apocalyptic number.

It is an amenable number.

243231213 is a deficient number, since it is larger than the sum of its proper divisors (81395155).

243231213 is a wasteful number, since it uses less digits than its factorization.

243231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79523.

The product of its digits is 864, while the sum is 21.

The square root of 243231213 is about 15595.8716652837. The cubic root of 243231213 is about 624.2230028677.

Adding to 243231213 its reverse (312132342), we get a palindrome (555363555).

The spelling of 243231213 in words is "two hundred forty-three million, two hundred thirty-one thousand, two hundred thirteen".