243255497 has 2 divisors, whose sum is σ = 243255498. Its totient is φ = 243255496.

The previous prime is 243255449. The next prime is 243255511. The reversal of 243255497 is 794552342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231770176 + 11485321 = 15224^2 + 3389^2 .

It is a cyclic number.

It is not a de Polignac number, because 243255497 - 2⁸ = 243255241 is a prime.

It is not a weakly prime, because it can be changed into another prime (243255437) 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, 121627748 + 121627749.

It is an arithmetic number, because the mean of its divisors is an integer number (121627749).

Almost surely, 2^243255497 is an apocalyptic number.

It is an amenable number.

243255497 is a deficient number, since it is larger than the sum of its proper divisors (1).

243255497 is an equidigital number, since it uses as much as digits as its factorization.

243255497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 41.

The square root of 243255497 is about 15596.6501852161. The cubic root of 243255497 is about 624.2437761431.

The spelling of 243255497 in words is "two hundred forty-three million, two hundred fifty-five thousand, four hundred ninety-seven".