243540331 has 8 divisors (see below), whose sum is σ = 247916480. Its totient is φ = 239196672.

The previous prime is 243540301. The next prime is 243540361. The reversal of 243540331 is 133045342.

It is an interprime number because it is at equal distance from previous prime (243540301) and next prime (243540361).

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 243540331 - 2⁵ = 243540299 is a prime.

It is a super-3 number, since 3×243540331³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243540296 and 243540305.

It is not an unprimeable number, because it can be changed into a prime (243540301) 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, 7261 + ... + 23233.

It is an arithmetic number, because the mean of its divisors is an integer number (30989560).

Almost surely, 2^243540331 is an apocalyptic number.

243540331 is a deficient number, since it is larger than the sum of its proper divisors (4376149).

243540331 is a wasteful number, since it uses less digits than its factorization.

243540331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16245.

The product of its (nonzero) digits is 4320, while the sum is 25.

The square root of 243540331 is about 15605.7787694174. The cubic root of 243540331 is about 624.4873287040.

Adding to 243540331 its reverse (133045342), we get a palindrome (376585673).

The spelling of 243540331 in words is "two hundred forty-three million, five hundred forty thousand, three hundred thirty-one".