243124213 has 4 divisors (see below), whose sum is σ = 243295308. Its totient is φ = 242953120.

The previous prime is 243124183. The next prime is 243124241. The reversal of 243124213 is 312421342.

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 149866564 + 93257649 = 12242^2 + 9657^2 .

It is a cyclic number.

It is not a de Polignac number, because 243124213 - 2⁹ = 243123701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243124253) 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, 83398 + ... + 86263.

It is an arithmetic number, because the mean of its divisors is an integer number (60823827).

Almost surely, 2^243124213 is an apocalyptic number.

It is an amenable number.

243124213 is a deficient number, since it is larger than the sum of its proper divisors (171095).

243124213 is a wasteful number, since it uses less digits than its factorization.

243124213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171094.

The product of its digits is 1152, while the sum is 22.

The square root of 243124213 is about 15592.4408929455. The cubic root of 243124213 is about 624.1314553273.

Adding to 243124213 its reverse (312421342), we get a palindrome (555545555).

The spelling of 243124213 in words is "two hundred forty-three million, one hundred twenty-four thousand, two hundred thirteen".