243505241 has 4 divisors (see below), whose sum is σ = 278291712. Its totient is φ = 208718772.

The previous prime is 243505231. The next prime is 243505303. The reversal of 243505241 is 142505342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243505241 - 2²⁶ = 176396377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243505241.

It is not an unprimeable number, because it can be changed into a prime (243505201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17393225 + ... + 17393238.

It is an arithmetic number, because the mean of its divisors is an integer number (69572928).

Almost surely, 2^243505241 is an apocalyptic number.

It is an amenable number.

243505241 is a deficient number, since it is larger than the sum of its proper divisors (34786471).

243505241 is an equidigital number, since it uses as much as digits as its factorization.

243505241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34786470.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 243505241 is about 15604.6544658957. The cubic root of 243505241 is about 624.4573346125.

The spelling of 243505241 in words is "two hundred forty-three million, five hundred five thousand, two hundred forty-one".