13127557 has 2 divisors, whose sum is σ = 13127558. Its totient is φ = 13127556.

The previous prime is 13127507. The next prime is 13127567. The reversal of 13127557 is 75572131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12489156 + 638401 = 3534^2 + 799^2 .

It is an emirp because it is prime and its reverse (75572131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13127557 - 2¹¹ = 13125509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13127507) 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 as a sum of consecutive naturals, namely, 6563778 + 6563779.

It is an arithmetic number, because the mean of its divisors is an integer number (6563779).

Almost surely, 2^13127557 is an apocalyptic number.

It is an amenable number.

13127557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13127557 is an equidigital number, since it uses as much as digits as its factorization.

13127557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 31.

The square root of 13127557 is about 3623.1970688882. The cubic root of 13127557 is about 235.9000162986.

Adding to 13127557 its reverse (75572131), we get a palindrome (88699688).

The spelling of 13127557 in words is "thirteen million, one hundred twenty-seven thousand, five hundred fifty-seven".