243331393 has 4 divisors (see below), whose sum is σ = 243467568. Its totient is φ = 243195220.

The previous prime is 243331391. The next prime is 243331409. The reversal of 243331393 is 393133342.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 243331393 - 2¹ = 243331391 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243331391) 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, 65371 + ... + 68992.

It is an arithmetic number, because the mean of its divisors is an integer number (60866892).

Almost surely, 2^243331393 is an apocalyptic number.

It is an amenable number.

243331393 is a deficient number, since it is larger than the sum of its proper divisors (136175).

243331393 is a wasteful number, since it uses less digits than its factorization.

243331393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136174.

The product of its digits is 17496, while the sum is 31.

The square root of 243331393 is about 15599.0830820276. The cubic root of 243331393 is about 624.3086909889.

The spelling of 243331393 in words is "two hundred forty-three million, three hundred thirty-one thousand, three hundred ninety-three".