243640963 has 2 divisors, whose sum is σ = 243640964. Its totient is φ = 243640962.

The previous prime is 243640949. The next prime is 243640979. The reversal of 243640963 is 369046342.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 243640963 - 2¹⁷ = 243509891 is a prime.

It is not a weakly prime, because it can be changed into another prime (243640993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121820481 + 121820482.

It is an arithmetic number, because the mean of its divisors is an integer number (121820482).

Almost surely, 2^243640963 is an apocalyptic number.

243640963 is a deficient number, since it is larger than the sum of its proper divisors (1).

243640963 is an equidigital number, since it uses as much as digits as its factorization.

243640963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 37.

The square root of 243640963 is about 15609.0026266895. The cubic root of 243640963 is about 624.5733305514.

The spelling of 243640963 in words is "two hundred forty-three million, six hundred forty thousand, nine hundred sixty-three".