243005505 has 8 divisors (see below), whose sum is σ = 388808832. Its totient is φ = 129602928.

The previous prime is 243005489. The next prime is 243005509. The reversal of 243005505 is 505500342.

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

It is not a de Polignac number, because 243005505 - 2⁴ = 243005489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243005509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8100169 + ... + 8100198.

It is an arithmetic number, because the mean of its divisors is an integer number (48601104).

Almost surely, 2^243005505 is an apocalyptic number.

It is an amenable number.

243005505 is a deficient number, since it is larger than the sum of its proper divisors (145803327).

243005505 is a wasteful number, since it uses less digits than its factorization.

243005505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16200375.

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 243005505 is about 15588.6338400772. The cubic root of 243005505 is about 624.0298591686.

Adding to 243005505 its reverse (505500342), we get a palindrome (748505847).

The spelling of 243005505 in words is "two hundred forty-three million, five thousand, five hundred five".