243040213 has 8 divisors (see below), whose sum is σ = 270761400. Its totient is φ = 216608448.

The previous prime is 243040201. The next prime is 243040247. The reversal of 243040213 is 312040342.

It can be written as a sum of positive squares in 4 ways, for example, as 19298449 + 223741764 = 4393^2 + 14958^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 243040213 - 2⁵ = 243040181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243040613) 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, 321958 + ... + 322711.

It is an arithmetic number, because the mean of its divisors is an integer number (33845175).

Almost surely, 2^243040213 is an apocalyptic number.

It is an amenable number.

243040213 is a deficient number, since it is larger than the sum of its proper divisors (27721187).

243040213 is a wasteful number, since it uses less digits than its factorization.

243040213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644711.

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

The square root of 243040213 is about 15589.7470473385. The cubic root of 243040213 is about 624.0595674082.

Adding to 243040213 its reverse (312040342), we get a palindrome (555080555).

It can be divided in two parts, 243040 and 213, that added together give a triangular number (243253 = T₆₉₇).

The spelling of 243040213 in words is "two hundred forty-three million, forty thousand, two hundred thirteen".