243010661 has 2 divisors, whose sum is σ = 243010662. Its totient is φ = 243010660.

The previous prime is 243010657. The next prime is 243010679. The reversal of 243010661 is 166010342.

It is a happy number.

243010661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 241336225 + 1674436 = 15535^2 + 1294^2 .

It is a cyclic number.

It is not a de Polignac number, because 243010661 - 2² = 243010657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243010861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121505330 + 121505331.

It is an arithmetic number, because the mean of its divisors is an integer number (121505331).

Almost surely, 2^243010661 is an apocalyptic number.

It is an amenable number.

243010661 is a deficient number, since it is larger than the sum of its proper divisors (1).

243010661 is an equidigital number, since it uses as much as digits as its factorization.

243010661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 243010661 is about 15588.7992161038. The cubic root of 243010661 is about 624.0342726149.

The spelling of 243010661 in words is "two hundred forty-three million, ten thousand, six hundred sixty-one".