123502541513 has 4 divisors (see below), whose sum is σ = 133002737028. Its totient is φ = 114002346000.

The previous prime is 123502541507. The next prime is 123502541521. The reversal of 123502541513 is 315145205321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315145205321 = 17107 ⋅18422003.

It can be written as a sum of positive squares in 2 ways, for example, as 50063167504 + 73439374009 = 223748^2 + 270997^2 .

It is a cyclic number.

It is not a de Polignac number, because 123502541513 - 2⁸ = 123502541257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123502541513.

It is not an unprimeable number, because it can be changed into a prime (123502531513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4750097738 + ... + 4750097763.

It is an arithmetic number, because the mean of its divisors is an integer number (33250684257).

Almost surely, 2^123502541513 is an apocalyptic number.

123502541513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

123502541513 is a deficient number, since it is larger than the sum of its proper divisors (9500195515).

123502541513 is an equidigital number, since it uses as much as digits as its factorization.

123502541513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9500195514.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 123502541513 its reverse (315145205321), we get a palindrome (438647746834).

The spelling of 123502541513 in words is "one hundred twenty-three billion, five hundred two million, five hundred forty-one thousand, five hundred thirteen".