13125517 has 4 divisors (see below), whose sum is σ = 13157116. Its totient is φ = 13093920.

The previous prime is 13125509. The next prime is 13125527. The reversal of 13125517 is 71552131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3798601 + 9326916 = 1949^2 + 3054^2 .

It is a cyclic number.

It is not a de Polignac number, because 13125517 - 2³ = 13125509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13125491 and 13125500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13125527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15168 + ... + 16009.

It is an arithmetic number, because the mean of its divisors is an integer number (3289279).

Almost surely, 2^13125517 is an apocalyptic number.

It is an amenable number.

13125517 is a deficient number, since it is larger than the sum of its proper divisors (31599).

13125517 is an equidigital number, since it uses as much as digits as its factorization.

13125517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31598.

The product of its digits is 1050, while the sum is 25.

The square root of 13125517 is about 3622.9155386236. The cubic root of 13125517 is about 235.8877961787.

Adding to 13125517 its reverse (71552131), we get a palindrome (84677648).

It can be divided in two parts, 13 and 125517, that multiplied together give a triangular number (1631721 = T₁₈₀₆).

The spelling of 13125517 in words is "thirteen million, one hundred twenty-five thousand, five hundred seventeen".