243420241 has 4 divisors (see below), whose sum is σ = 243662500. Its totient is φ = 243177984.

The previous prime is 243420227. The next prime is 243420283. The reversal of 243420241 is 142024342.

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: 142024342 = 2 ⋅71012171.

It can be written as a sum of positive squares in 2 ways, for example, as 101929216 + 141491025 = 10096^2 + 11895^2 .

It is a cyclic number.

It is not a de Polignac number, because 243420241 - 2¹³ = 243412049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243420211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119616 + ... + 121633.

It is an arithmetic number, because the mean of its divisors is an integer number (60915625).

Almost surely, 2^243420241 is an apocalyptic number.

It is an amenable number.

243420241 is a deficient number, since it is larger than the sum of its proper divisors (242259).

243420241 is a wasteful number, since it uses less digits than its factorization.

243420241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242258.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 243420241 is about 15601.9306818099. The cubic root of 243420241 is about 624.3846667027.

Adding to 243420241 its reverse (142024342), we get a palindrome (385444583).

The spelling of 243420241 in words is "two hundred forty-three million, four hundred twenty thousand, two hundred forty-one".