243401513 has 2 divisors, whose sum is σ = 243401514. Its totient is φ = 243401512.

The previous prime is 243401507. The next prime is 243401531. The reversal of 243401513 is 315104342.

Together with next prime (243401531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212343184 + 31058329 = 14572^2 + 5573^2 .

It is a cyclic number.

It is not a de Polignac number, because 243401513 - 2⁴ = 243401497 is a prime.

It is not a weakly prime, because it can be changed into another prime (243401593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121700756 + 121700757.

It is an arithmetic number, because the mean of its divisors is an integer number (121700757).

Almost surely, 2^243401513 is an apocalyptic number.

It is an amenable number.

243401513 is a deficient number, since it is larger than the sum of its proper divisors (1).

243401513 is an equidigital number, since it uses as much as digits as its factorization.

243401513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 243401513 is about 15601.3304881347. The cubic root of 243401513 is about 624.3686535507.

Adding to 243401513 its reverse (315104342), we get a palindrome (558505855).

The spelling of 243401513 in words is "two hundred forty-three million, four hundred one thousand, five hundred thirteen".