123340523513 has 2 divisors, whose sum is σ = 123340523514. Its totient is φ = 123340523512.

The previous prime is 123340523447. The next prime is 123340523561. The reversal of 123340523513 is 315325043321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101208605689 + 22131917824 = 318133^2 + 148768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123340523513 is a prime.

It is a super-2 number, since 2×123340523513² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 123340523513.

It is not a weakly prime, because it can be changed into another prime (123340523563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61670261756 + 61670261757.

It is an arithmetic number, because the mean of its divisors is an integer number (61670261757).

Almost surely, 2^123340523513 is an apocalyptic number.

It is an amenable number.

123340523513 is a deficient number, since it is larger than the sum of its proper divisors (1).

123340523513 is an equidigital number, since it uses as much as digits as its factorization.

123340523513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 32.

Adding to 123340523513 its reverse (315325043321), we get a palindrome (438665566834).

The spelling of 123340523513 in words is "one hundred twenty-three billion, three hundred forty million, five hundred twenty-three thousand, five hundred thirteen".