243978283 has 2 divisors, whose sum is σ = 243978284. Its totient is φ = 243978282.

The previous prime is 243978233. The next prime is 243978311. The reversal of 243978283 is 382879342.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 243978283 - 2⁹ = 243977771 is a prime.

It is not a weakly prime, because it can be changed into another prime (243978233) 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, 121989141 + 121989142.

It is an arithmetic number, because the mean of its divisors is an integer number (121989142).

Almost surely, 2^243978283 is an apocalyptic number.

243978283 is a deficient number, since it is larger than the sum of its proper divisors (1).

243978283 is an equidigital number, since it uses as much as digits as its factorization.

243978283 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 46.

The square root of 243978283 is about 15619.8041921146. The cubic root of 243978283 is about 624.8614374429.

The spelling of 243978283 in words is "two hundred forty-three million, nine hundred seventy-eight thousand, two hundred eighty-three".