243790663 has 2 divisors, whose sum is σ = 243790664. Its totient is φ = 243790662.

The previous prime is 243790643. The next prime is 243790711. The reversal of 243790663 is 366097342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243790663 - 2²⁵ = 210236231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243790643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121895331 + 121895332.

It is an arithmetic number, because the mean of its divisors is an integer number (121895332).

Almost surely, 2^243790663 is an apocalyptic number.

243790663 is a deficient number, since it is larger than the sum of its proper divisors (1).

243790663 is an equidigital number, since it uses as much as digits as its factorization.

243790663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 40.

The square root of 243790663 is about 15613.7971999126. The cubic root of 243790663 is about 624.7012229544.

The spelling of 243790663 in words is "two hundred forty-three million, seven hundred ninety thousand, six hundred sixty-three".