243230121 has 28 divisors (see below), whose sum is σ = 368144260. Its totient is φ = 160613280.

The previous prime is 243230111. The next prime is 243230137. The reversal of 243230121 is 121032342.

It can be written as a sum of positive squares in 2 ways, for example, as 206324496 + 36905625 = 14364^2 + 6075^2 .

It is not a de Polignac number, because 243230121 - 2²² = 239035817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243230094 and 243230103.

It is not an unprimeable number, because it can be changed into a prime (243230111) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 77931 + ... + 80991.

Almost surely, 2^243230121 is an apocalyptic number.

It is an amenable number.

243230121 is a deficient number, since it is larger than the sum of its proper divisors (124914139).

243230121 is an equidigital number, since it uses as much as digits as its factorization.

243230121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3188 (or 3173 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 243230121 is about 15595.8366559797. The cubic root of 243230121 is about 624.2220687050. Note that the first 3 decimals are identical.

Adding to 243230121 its reverse (121032342), we get a palindrome (364262463).

The spelling of 243230121 in words is "two hundred forty-three million, two hundred thirty thousand, one hundred twenty-one".