243665011 has 2 divisors, whose sum is σ = 243665012. Its totient is φ = 243665010.

The previous prime is 243664969. The next prime is 243665033. The reversal of 243665011 is 110566342.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243665011 is a prime.

It is not a weakly prime, because it can be changed into another prime (243666011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121832505 + 121832506.

It is an arithmetic number, because the mean of its divisors is an integer number (121832506).

Almost surely, 2^243665011 is an apocalyptic number.

243665011 is a deficient number, since it is larger than the sum of its proper divisors (1).

243665011 is an equidigital number, since it uses as much as digits as its factorization.

243665011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 243665011 is about 15609.7729323652. The cubic root of 243665011 is about 624.5938788822.

The spelling of 243665011 in words is "two hundred forty-three million, six hundred sixty-five thousand, eleven".