243332401 has 4 divisors (see below), whose sum is σ = 262050292. Its totient is φ = 224614512.

The previous prime is 243332371. The next prime is 243332443. The reversal of 243332401 is 104233342.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36663025 + 206669376 = 6055^2 + 14376^2 .

It is a cyclic number.

It is not a de Polignac number, because 243332401 - 2²¹ = 241235249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243332501) 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, 9358926 + ... + 9358951.

It is an arithmetic number, because the mean of its divisors is an integer number (65512573).

Almost surely, 2^243332401 is an apocalyptic number.

It is an amenable number.

243332401 is a deficient number, since it is larger than the sum of its proper divisors (18717891).

243332401 is a wasteful number, since it uses less digits than its factorization.

243332401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18717890.

The product of its (nonzero) digits is 1728, while the sum is 22.

The square root of 243332401 is about 15599.1153915855. The cubic root of 243332401 is about 624.3095530537.

Adding to 243332401 its reverse (104233342), we get a palindrome (347565743).

The spelling of 243332401 in words is "two hundred forty-three million, three hundred thirty-two thousand, four hundred one".