245257 has 2 divisors, whose sum is σ = 245258. Its totient is φ = 245256.

The previous prime is 245251. The next prime is 245261. The reversal of 245257 is 752542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175561 + 69696 = 419^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 245257 - 2⁷ = 245129 is a prime.

It is not a weakly prime, because it can be changed into another prime (245251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122628 + 122629.

It is an arithmetic number, because the mean of its divisors is an integer number (122629).

2²⁴⁵²⁵⁷ is an apocalyptic number.

It is an amenable number.

245257 is a deficient number, since it is larger than the sum of its proper divisors (1).

245257 is an equidigital number, since it uses as much as digits as its factorization.

245257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2800, while the sum is 25.

The square root of 245257 is about 495.2342879890. The cubic root of 245257 is about 62.5951191641.

Adding to 245257 its reverse (752542), we get a palindrome (997799).

The spelling of 245257 in words is "two hundred forty-five thousand, two hundred fifty-seven".