243000641 has 4 divisors (see below), whose sum is σ = 261693012. Its totient is φ = 224308272.

The previous prime is 243000629. The next prime is 243000649. The reversal of 243000641 is 146000342.

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: 146000342 = 2 ⋅73000171.

It can be written as a sum of positive squares in 2 ways, for example, as 160554241 + 82446400 = 12671^2 + 9080^2 .

It is a cyclic number.

It is not a de Polignac number, because 243000641 - 2⁶ = 243000577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243000649) 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, 9346166 + ... + 9346191.

It is an arithmetic number, because the mean of its divisors is an integer number (65423253).

Almost surely, 2^243000641 is an apocalyptic number.

It is an amenable number.

243000641 is a deficient number, since it is larger than the sum of its proper divisors (18692371).

243000641 is a wasteful number, since it uses less digits than its factorization.

243000641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18692370.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 243000641 is about 15588.4778281909. The cubic root of 243000641 is about 624.0256956121.

Adding to 243000641 its reverse (146000342), we get a palindrome (389000983).

The spelling of 243000641 in words is "two hundred forty-three million, six hundred forty-one", and thus it is an aban number.