243563426 has 4 divisors (see below), whose sum is σ = 365345142. Its totient is φ = 121781712.

The previous prime is 243563401. The next prime is 243563429. The reversal of 243563426 is 624365342.

243563426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 243391201 + 172225 = 15601^2 + 415^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243563429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60890855 + ... + 60890858.

Almost surely, 2^243563426 is an apocalyptic number.

243563426 is a deficient number, since it is larger than the sum of its proper divisors (121781716).

243563426 is a wasteful number, since it uses less digits than its factorization.

243563426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121781715.

The product of its digits is 103680, while the sum is 35.

The square root of 243563426 is about 15606.5187021321. The cubic root of 243563426 is about 624.5070681847.

The spelling of 243563426 in words is "two hundred forty-three million, five hundred sixty-three thousand, four hundred twenty-six".