13126557 has 4 divisors (see below), whose sum is σ = 17502080. Its totient is φ = 8751036.

The previous prime is 13126541. The next prime is 13126571. The reversal of 13126557 is 75562131.

13126557 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 13126557 - 2⁴ = 13126541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13126507) 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, 2187757 + ... + 2187762.

It is an arithmetic number, because the mean of its divisors is an integer number (4375520).

Almost surely, 2^13126557 is an apocalyptic number.

It is an amenable number.

13126557 is a deficient number, since it is larger than the sum of its proper divisors (4375523).

13126557 is an equidigital number, since it uses as much as digits as its factorization.

13126557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4375522.

The product of its digits is 6300, while the sum is 30.

The square root of 13126557 is about 3623.0590665900. The cubic root of 13126557 is about 235.8940262020.

Adding to 13126557 its reverse (75562131), we get a palindrome (88688688).

The spelling of 13126557 in words is "thirteen million, one hundred twenty-six thousand, five hundred fifty-seven".