243312231 has 4 divisors (see below), whose sum is σ = 324416312. Its totient is φ = 162208152.

The previous prime is 243312229. The next prime is 243312257. The reversal of 243312231 is 132213342.

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

It is not a de Polignac number, because 243312231 - 2¹ = 243312229 is a prime.

It is a super-2 number, since 2×243312231² = 118401683508394722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243312198 and 243312207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243312281) 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 3 ways as a sum of consecutive naturals, for example, 40552036 + ... + 40552041.

It is an arithmetic number, because the mean of its divisors is an integer number (81104078).

Almost surely, 2^243312231 is an apocalyptic number.

243312231 is a deficient number, since it is larger than the sum of its proper divisors (81104081).

243312231 is an equidigital number, since it uses as much as digits as its factorization.

243312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81104080.

The product of its digits is 864, while the sum is 21.

The square root of 243312231 is about 15598.4688671677. The cubic root of 243312231 is about 624.2923027525.

Adding to 243312231 its reverse (132213342), we get a palindrome (375525573).

It can be divided in two parts, 24331 and 2231, that added together give a palindrome (26562).

The spelling of 243312231 in words is "two hundred forty-three million, three hundred twelve thousand, two hundred thirty-one".