243409841 has 4 divisors (see below), whose sum is σ = 243700800. Its totient is φ = 243118884.

The previous prime is 243409819. The next prime is 243409843. The reversal of 243409841 is 148904342.

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 243409841 - 2¹⁴ = 243393457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243409843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144221 + ... + 145898.

It is an arithmetic number, because the mean of its divisors is an integer number (60925200).

Almost surely, 2^243409841 is an apocalyptic number.

It is an amenable number.

243409841 is a deficient number, since it is larger than the sum of its proper divisors (290959).

243409841 is an equidigital number, since it uses as much as digits as its factorization.

243409841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290958.

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 243409841 is about 15601.5973861653. The cubic root of 243409841 is about 624.3757744088.

The spelling of 243409841 in words is "two hundred forty-three million, four hundred nine thousand, eight hundred forty-one".