243255505 has 4 divisors (see below), whose sum is σ = 291906612. Its totient is φ = 194604400.

The previous prime is 243255497. The next prime is 243255511. The reversal of 243255505 is 505552342.

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 183765136 + 59490369 = 13556^2 + 7713^2 .

It is not a de Polignac number, because 243255505 - 2³ = 243255497 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24325546 + ... + 24325555.

It is an arithmetic number, because the mean of its divisors is an integer number (72976653).

Almost surely, 2^243255505 is an apocalyptic number.

It is an amenable number.

243255505 is a deficient number, since it is larger than the sum of its proper divisors (48651107).

243255505 is an equidigital number, since it uses as much as digits as its factorization.

243255505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48651106.

The product of its (nonzero) digits is 30000, while the sum is 31.

The square root of 243255505 is about 15596.6504416814. The cubic root of 243255505 is about 624.2437829864.

The spelling of 243255505 in words is "two hundred forty-three million, two hundred fifty-five thousand, five hundred five".