243040033 has 8 divisors (see below), whose sum is σ = 247876200. Its totient is φ = 238213248.

The previous prime is 243040003. The next prime is 243040067. The reversal of 243040033 is 330040342.

It can be written as a sum of positive squares in 4 ways, for example, as 18249984 + 224790049 = 4272^2 + 14993^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243040033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243040003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74133 + ... + 77341.

It is an arithmetic number, because the mean of its divisors is an integer number (30984525).

Almost surely, 2^243040033 is an apocalyptic number.

It is an amenable number.

243040033 is a deficient number, since it is larger than the sum of its proper divisors (4836167).

243040033 is a wasteful number, since it uses less digits than its factorization.

243040033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4691.

The product of its (nonzero) digits is 864, while the sum is 19.

The square root of 243040033 is about 15589.7412743124. The cubic root of 243040033 is about 624.0594133449.

Adding to 243040033 its reverse (330040342), we get a palindrome (573080375).

The spelling of 243040033 in words is "two hundred forty-three million, forty thousand, thirty-three".