243350809 has 4 divisors (see below), whose sum is σ = 262070116. Its totient is φ = 224631504.

The previous prime is 243350797. The next prime is 243350827. The reversal of 243350809 is 908053342.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139310809 + 104040000 = 11803^2 + 10200^2 .

It is a cyclic number.

It is not a de Polignac number, because 243350809 - 2²¹ = 241253657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243350839) 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, 9359634 + ... + 9359659.

It is an arithmetic number, because the mean of its divisors is an integer number (65517529).

Almost surely, 2^243350809 is an apocalyptic number.

It is an amenable number.

243350809 is a deficient number, since it is larger than the sum of its proper divisors (18719307).

243350809 is a wasteful number, since it uses less digits than its factorization.

243350809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18719306.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 243350809 is about 15599.7054138852. The cubic root of 243350809 is about 624.3252955804.

The spelling of 243350809 in words is "two hundred forty-three million, three hundred fifty thousand, eight hundred nine".