243113323513 has 2 divisors, whose sum is σ = 243113323514. Its totient is φ = 243113323512.

The previous prime is 243113323511. The next prime is 243113323543. The reversal of 243113323513 is 315323311342.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227440286649 + 15673036864 = 476907^2 + 125192^2 .

It is a cyclic number.

It is not a de Polignac number, because 243113323513 - 2¹ = 243113323511 is a prime.

It is a super-2 number, since 2×243113323513² (a number of 24 digits) contains 22 as substring.

Together with 243113323511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (243113323511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121556661756 + 121556661757.

It is an arithmetic number, because the mean of its divisors is an integer number (121556661757).

Almost surely, 2^243113323513 is an apocalyptic number.

It is an amenable number.

243113323513 is a deficient number, since it is larger than the sum of its proper divisors (1).

243113323513 is an equidigital number, since it uses as much as digits as its factorization.

243113323513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 31.

Adding to 243113323513 its reverse (315323311342), we get a palindrome (558436634855).

The spelling of 243113323513 in words is "two hundred forty-three billion, one hundred thirteen million, three hundred twenty-three thousand, five hundred thirteen".