13145257 has 2 divisors, whose sum is σ = 13145258. Its totient is φ = 13145256.

The previous prime is 13145243. The next prime is 13145263. The reversal of 13145257 is 75254131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13133376 + 11881 = 3624^2 + 109^2 .

It is an emirp because it is prime and its reverse (75254131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13145257 - 2²³ = 4756649 is a prime.

It is not a weakly prime, because it can be changed into another prime (13145357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6572628 + 6572629.

It is an arithmetic number, because the mean of its divisors is an integer number (6572629).

Almost surely, 2^13145257 is an apocalyptic number.

It is an amenable number.

13145257 is a deficient number, since it is larger than the sum of its proper divisors (1).

13145257 is an equidigital number, since it uses as much as digits as its factorization.

13145257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4200, while the sum is 28.

The square root of 13145257 is about 3625.6388402597. The cubic root of 13145257 is about 236.0059907030.

Adding to 13145257 its reverse (75254131), we get a palindrome (88399388).

The spelling of 13145257 in words is "thirteen million, one hundred forty-five thousand, two hundred fifty-seven".