13320257 has 2 divisors, whose sum is σ = 13320258. Its totient is φ = 13320256.

The previous prime is 13320247. The next prime is 13320271. The reversal of 13320257 is 75202331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11082241 + 2238016 = 3329^2 + 1496^2 .

It is a cyclic number.

It is not a de Polignac number, because 13320257 - 2⁸ = 13320001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13320217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6660128 + 6660129.

It is an arithmetic number, because the mean of its divisors is an integer number (6660129).

Almost surely, 2^13320257 is an apocalyptic number.

It is an amenable number.

13320257 is a deficient number, since it is larger than the sum of its proper divisors (1).

13320257 is an equidigital number, since it uses as much as digits as its factorization.

13320257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 13320257 is about 3649.6927267922. The cubic root of 13320257 is about 237.0486764066.

Adding to 13320257 its reverse (75202331), we get a palindrome (88522588).

The spelling of 13320257 in words is "thirteen million, three hundred twenty thousand, two hundred fifty-seven".