243248281 has 2 divisors, whose sum is σ = 243248282. Its totient is φ = 243248280.

The previous prime is 243248261. The next prime is 243248293. The reversal of 243248281 is 182842342.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227527056 + 15721225 = 15084^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 243248281 - 2⁷ = 243248153 is a prime.

It is a super-2 number, since 2×243248281² = 118339452418909922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (243248231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121624140 + 121624141.

It is an arithmetic number, because the mean of its divisors is an integer number (121624141).

Almost surely, 2^243248281 is an apocalyptic number.

It is an amenable number.

243248281 is a deficient number, since it is larger than the sum of its proper divisors (1).

243248281 is an equidigital number, since it uses as much as digits as its factorization.

243248281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 34.

The square root of 243248281 is about 15596.4188517749. The cubic root of 243248281 is about 624.2376035007.

The spelling of 243248281 in words is "two hundred forty-three million, two hundred forty-eight thousand, two hundred eighty-one".