243563 has 4 divisors (see below), whose sum is σ = 245328. Its totient is φ = 241800.

The previous prime is 243553. The next prime is 243577. The reversal of 243563 is 365342.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243563 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 4⁸ + 5³ + 3³ + 6³ + 3¹¹ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243533) 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, 656 + ... + 957.

It is an arithmetic number, because the mean of its divisors is an integer number (61332).

2²⁴³⁵⁶³ is an apocalyptic number.

243563 is a deficient number, since it is larger than the sum of its proper divisors (1765).

243563 is a wasteful number, since it uses less digits than its factorization.

243563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1764.

The product of its digits is 2160, while the sum is 23.

The square root of 243563 is about 493.5210228552. The cubic root of 243563 is about 62.4506704090.

The spelling of 243563 in words is "two hundred forty-three thousand, five hundred sixty-three".