243023231 has 4 divisors (see below), whose sum is σ = 265116264. Its totient is φ = 220930200.

The previous prime is 243023213. The next prime is 243023251. The reversal of 243023231 is 132320342.

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

It is a cyclic number.

It is not a de Polignac number, because 243023231 - 2¹⁸ = 242761087 is a prime.

It is a super-2 number, since 2×243023231² = 118120581611358722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243023201) 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, 11046500 + ... + 11046521.

It is an arithmetic number, because the mean of its divisors is an integer number (66279066).

Almost surely, 2^243023231 is an apocalyptic number.

243023231 is a deficient number, since it is larger than the sum of its proper divisors (22093033).

243023231 is a wasteful number, since it uses less digits than its factorization.

243023231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22093032.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 243023231 is about 15589.2023849843. The cubic root of 243023231 is about 624.0450320545.

Adding to 243023231 its reverse (132320342), we get a palindrome (375343573).

The spelling of 243023231 in words is "two hundred forty-three million, twenty-three thousand, two hundred thirty-one".