245321257 has 2 divisors, whose sum is σ = 245321258. Its totient is φ = 245321256.

The previous prime is 245321231. The next prime is 245321281. The reversal of 245321257 is 752123542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 171636201 + 73685056 = 13101^2 + 8584^2 .

It is a cyclic number.

It is not a de Polignac number, because 245321257 - 2⁷ = 245321129 is a prime.

It is not a weakly prime, because it can be changed into another prime (245321227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122660628 + 122660629.

It is an arithmetic number, because the mean of its divisors is an integer number (122660629).

Almost surely, 2^245321257 is an apocalyptic number.

It is an amenable number.

245321257 is a deficient number, since it is larger than the sum of its proper divisors (1).

245321257 is an equidigital number, since it uses as much as digits as its factorization.

245321257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 31.

The square root of 245321257 is about 15662.7346590562. The cubic root of 245321257 is about 626.0058529872.

Adding to 245321257 its reverse (752123542), we get a palindrome (997444799).

The spelling of 245321257 in words is "two hundred forty-five million, three hundred twenty-one thousand, two hundred fifty-seven".