241809 has 4 divisors (see below), whose sum is σ = 322416. Its totient is φ = 161204.

The previous prime is 241807. The next prime is 241811. The reversal of 241809 is 908142.

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 an interprime number because it is at equal distance from previous prime (241807) and next prime (241811).

It is a cyclic number.

It is not a de Polignac number, because 241809 - 2¹ = 241807 is a prime.

It is an Ulam number.

It is a D-number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 241809.

It is not an unprimeable number, because it can be changed into a prime (241807) 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, 40299 + ... + 40304.

It is an arithmetic number, because the mean of its divisors is an integer number (80604).

2²⁴¹⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

241809 is a deficient number, since it is larger than the sum of its proper divisors (80607).

241809 is an equidigital number, since it uses as much as digits as its factorization.

241809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80606.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 241809 is about 491.7407853738. The cubic root of 241809 is about 62.3003978892.

The spelling of 241809 in words is "two hundred forty-one thousand, eight hundred nine".