243240863 has 4 divisors (see below), whose sum is σ = 243371520. Its totient is φ = 243110208.

The previous prime is 243240859. The next prime is 243240883. The reversal of 243240863 is 368042342.

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

It is a cyclic number.

It is not a de Polignac number, because 243240863 - 2² = 243240859 is a prime.

It is a super-2 number, since 2×243240863² = 118332234865969538, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243240883) 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, 62495 + ... + 66272.

It is an arithmetic number, because the mean of its divisors is an integer number (60842880).

Almost surely, 2^243240863 is an apocalyptic number.

243240863 is a deficient number, since it is larger than the sum of its proper divisors (130657).

243240863 is a wasteful number, since it uses less digits than its factorization.

243240863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130656.

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 243240863 is about 15596.1810389595. The cubic root of 243240863 is about 624.2312579380.

The spelling of 243240863 in words is "two hundred forty-three million, two hundred forty thousand, eight hundred sixty-three".