243808461 has 48 divisors (see below), whose sum is σ = 397365696. Its totient is φ = 148490496.

The previous prime is 243808417. The next prime is 243808471. The reversal of 243808461 is 164808342.

It is not a de Polignac number, because 243808461 - 2¹³ = 243800269 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243808471) 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 47 ways as a sum of consecutive naturals, for example, 356626 + ... + 357308.

It is an arithmetic number, because the mean of its divisors is an integer number (8278452).

Almost surely, 2^243808461 is an apocalyptic number.

It is an amenable number.

243808461 is a deficient number, since it is larger than the sum of its proper divisors (153557235).

243808461 is a wasteful number, since it uses less digits than its factorization.

243808461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824 (or 812 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 243808461 is about 15614.3671341492. The cubic root of 243808461 is about 624.7164247422.

The spelling of 243808461 in words is "two hundred forty-three million, eight hundred eight thousand, four hundred sixty-one".