243696321 has 12 divisors (see below), whose sum is σ = 384006480. Its totient is φ = 147694680.

The previous prime is 243696317. The next prime is 243696347. The reversal of 243696321 is 123696342.

243696321 is a `hidden beast` number, since 243 + 6 + 96 + 321 = 666.

It is not a de Polignac number, because 243696321 - 2² = 243696317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243696361) 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 11 ways as a sum of consecutive naturals, for example, 1230691 + ... + 1230888.

It is an arithmetic number, because the mean of its divisors is an integer number (32000540).

Almost surely, 2^243696321 is an apocalyptic number.

It is an amenable number.

243696321 is a deficient number, since it is larger than the sum of its proper divisors (140310159).

243696321 is a wasteful number, since it uses less digits than its factorization.

243696321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2461596 (or 2461593 counting only the distinct ones).

The product of its digits is 46656, while the sum is 36.

The square root of 243696321 is about 15610.7757975060. The cubic root of 243696321 is about 624.6206303591.

The spelling of 243696321 in words is "two hundred forty-three million, six hundred ninety-six thousand, three hundred twenty-one".