243540213 has 16 divisors (see below), whose sum is σ = 371458176. Its totient is φ = 139034880.

The previous prime is 243540211. The next prime is 243540251. The reversal of 243540213 is 312045342.

It is not a de Polignac number, because 243540213 - 2¹ = 243540211 is a prime.

It is a super-3 number, since 3×243540213³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243540211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20193 + ... + 29913.

It is an arithmetic number, because the mean of its divisors is an integer number (23216136).

Almost surely, 2^243540213 is an apocalyptic number.

It is an amenable number.

243540213 is a deficient number, since it is larger than the sum of its proper divisors (127917963).

243540213 is a wasteful number, since it uses less digits than its factorization.

243540213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10924.

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 243540213 is about 15605.7749887662. The cubic root of 243540213 is about 624.4872278453.

Adding to 243540213 its reverse (312045342), we get a palindrome (555585555).

The spelling of 243540213 in words is "two hundred forty-three million, five hundred forty thousand, two hundred thirteen".