243561233 has 2 divisors, whose sum is σ = 243561234. Its totient is φ = 243561232.

The previous prime is 243561229. The next prime is 243561251. The reversal of 243561233 is 332165342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228100609 + 15460624 = 15103^2 + 3932^2 .

It is a cyclic number.

It is not a de Polignac number, because 243561233 - 2² = 243561229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243561196 and 243561205.

It is not a weakly prime, because it can be changed into another prime (243561223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121780616 + 121780617.

It is an arithmetic number, because the mean of its divisors is an integer number (121780617).

Almost surely, 2^243561233 is an apocalyptic number.

It is an amenable number.

243561233 is a deficient number, since it is larger than the sum of its proper divisors (1).

243561233 is an equidigital number, since it uses as much as digits as its factorization.

243561233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 29.

The square root of 243561233 is about 15606.4484428713. The cubic root of 243561233 is about 624.5051938637.

The spelling of 243561233 in words is "two hundred forty-three million, five hundred sixty-one thousand, two hundred thirty-three".