243895513 has 2 divisors, whose sum is σ = 243895514. Its totient is φ = 243895512.

The previous prime is 243895501. The next prime is 243895517. The reversal of 243895513 is 315598342.

243895513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221503689 + 22391824 = 14883^2 + 4732^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243895513 is a prime.

It is not a weakly prime, because it can be changed into another prime (243895517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121947756 + 121947757.

It is an arithmetic number, because the mean of its divisors is an integer number (121947757).

Almost surely, 2^243895513 is an apocalyptic number.

It is an amenable number.

243895513 is a deficient number, since it is larger than the sum of its proper divisors (1).

243895513 is an equidigital number, since it uses as much as digits as its factorization.

243895513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The square root of 243895513 is about 15617.1544463132. The cubic root of 243895513 is about 624.7907677228.

The spelling of 243895513 in words is "two hundred forty-three million, eight hundred ninety-five thousand, five hundred thirteen".