135305257 has 2 divisors, whose sum is σ = 135305258. Its totient is φ = 135305256.

The previous prime is 135305239. The next prime is 135305267. The reversal of 135305257 is 752503531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111598096 + 23707161 = 10564^2 + 4869^2 .

It is a cyclic number.

It is not a de Polignac number, because 135305257 - 2⁷ = 135305129 is a prime.

It is not a weakly prime, because it can be changed into another prime (135305267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67652628 + 67652629.

It is an arithmetic number, because the mean of its divisors is an integer number (67652629).

Almost surely, 2^135305257 is an apocalyptic number.

It is an amenable number.

135305257 is a deficient number, since it is larger than the sum of its proper divisors (1).

135305257 is an equidigital number, since it uses as much as digits as its factorization.

135305257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 31.

The square root of 135305257 is about 11632.0787909986. The cubic root of 135305257 is about 513.3791463676.

Adding to 135305257 its reverse (752503531), we get a palindrome (887808788).

The spelling of 135305257 in words is "one hundred thirty-five million, three hundred five thousand, two hundred fifty-seven".