13124813 has 4 divisors (see below), whose sum is σ = 14134428. Its totient is φ = 12115200.

The previous prime is 13124809. The next prime is 13124819. The reversal of 13124813 is 31842131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31842131 = 179 ⋅177889.

It can be written as a sum of positive squares in 2 ways, for example, as 1747684 + 11377129 = 1322^2 + 3373^2 .

It is a cyclic number.

It is not a de Polignac number, because 13124813 - 2² = 13124809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13124819) 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, 504788 + ... + 504813.

It is an arithmetic number, because the mean of its divisors is an integer number (3533607).

Almost surely, 2^13124813 is an apocalyptic number.

13124813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

13124813 is a deficient number, since it is larger than the sum of its proper divisors (1009615).

13124813 is a wasteful number, since it uses less digits than its factorization.

13124813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009614.

The product of its digits is 576, while the sum is 23.

The square root of 13124813 is about 3622.8183780035. The cubic root of 13124813 is about 235.8835787454.

Adding to 13124813 its reverse (31842131), we get a palindrome (44966944).

The spelling of 13124813 in words is "thirteen million, one hundred twenty-four thousand, eight hundred thirteen".