13145557 has 2 divisors, whose sum is σ = 13145558. Its totient is φ = 13145556.

The previous prime is 13145533. The next prime is 13145597. The reversal of 13145557 is 75554131.

13145557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12117361 + 1028196 = 3481^2 + 1014^2 .

It is a cyclic number.

It is not a de Polignac number, because 13145557 - 2¹⁹ = 12621269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13145507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6572778 + 6572779.

It is an arithmetic number, because the mean of its divisors is an integer number (6572779).

Almost surely, 2^13145557 is an apocalyptic number.

It is an amenable number.

13145557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13145557 is an equidigital number, since it uses as much as digits as its factorization.

13145557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10500, while the sum is 31.

The square root of 13145557 is about 3625.6802120430. The cubic root of 13145557 is about 236.0077860593.

Adding to 13145557 its reverse (75554131), we get a palindrome (88699688).

The spelling of 13145557 in words is "thirteen million, one hundred forty-five thousand, five hundred fifty-seven".