243415243 has 4 divisors (see below), whose sum is σ = 243463720. Its totient is φ = 243366768.

The previous prime is 243415199. The next prime is 243415247. The reversal of 243415243 is 342514342.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 342514342 = 2 ⋅171257171.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243415243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243415247) 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, 15705 + ... + 27082.

It is an arithmetic number, because the mean of its divisors is an integer number (60865930).

Almost surely, 2^243415243 is an apocalyptic number.

243415243 is a deficient number, since it is larger than the sum of its proper divisors (48477).

243415243 is an equidigital number, since it uses as much as digits as its factorization.

243415243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48476.

The product of its digits is 11520, while the sum is 28.

The square root of 243415243 is about 15601.7705085032. The cubic root of 243415243 is about 624.3803933031.

Adding to 243415243 its reverse (342514342), we get a palindrome (585929585).

Subtracting 243415243 from its reverse (342514342), we obtain a palindrome (99099099).

It can be divided in two parts, 24341 and 5243, that added together give a square (29584 = 172²).

The spelling of 243415243 in words is "two hundred forty-three million, four hundred fifteen thousand, two hundred forty-three".