12722257 has 2 divisors, whose sum is σ = 12722258. Its totient is φ = 12722256.

The previous prime is 12722249. The next prime is 12722261. The reversal of 12722257 is 75222721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8433216 + 4289041 = 2904^2 + 2071^2 .

It is a cyclic number.

It is not a de Polignac number, because 12722257 - 2³ = 12722249 is a prime.

It is not a weakly prime, because it can be changed into another prime (12722287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6361128 + 6361129.

It is an arithmetic number, because the mean of its divisors is an integer number (6361129).

Almost surely, 2^12722257 is an apocalyptic number.

It is an amenable number.

12722257 is a deficient number, since it is larger than the sum of its proper divisors (1).

12722257 is an equidigital number, since it uses as much as digits as its factorization.

12722257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3920, while the sum is 28.

The square root of 12722257 is about 3566.8273016786. The cubic root of 12722257 is about 233.4468696893.

Adding to 12722257 its reverse (75222721), we get a palindrome (87944978).

The spelling of 12722257 in words is "twelve million, seven hundred twenty-two thousand, two hundred fifty-seven".