243646241 has 2 divisors, whose sum is σ = 243646242. Its totient is φ = 243646240.

The previous prime is 243646219. The next prime is 243646301. The reversal of 243646241 is 142646342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241149841 + 2496400 = 15529^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 243646241 - 2¹⁰ = 243645217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 243646198 and 243646207.

It is not a weakly prime, because it can be changed into another prime (243646541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121823120 + 121823121.

It is an arithmetic number, because the mean of its divisors is an integer number (121823121).

Almost surely, 2^243646241 is an apocalyptic number.

It is an amenable number.

243646241 is a deficient number, since it is larger than the sum of its proper divisors (1).

243646241 is an equidigital number, since it uses as much as digits as its factorization.

243646241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 32.

The square root of 243646241 is about 15609.1716948722. The cubic root of 243646241 is about 624.5778405678.

The spelling of 243646241 in words is "two hundred forty-three million, six hundred forty-six thousand, two hundred forty-one".