8211444257 has 2 divisors, whose sum is σ = 8211444258. Its totient is φ = 8211444256.

The previous prime is 8211444253. The next prime is 8211444271. The reversal of 8211444257 is 7524441128.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7136194576 + 1075249681 = 84476^2 + 32791^2 .

It is a cyclic number.

It is not a de Polignac number, because 8211444257 - 2² = 8211444253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8211444257.

It is not a weakly prime, because it can be changed into another prime (8211444253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4105722128 + 4105722129.

It is an arithmetic number, because the mean of its divisors is an integer number (4105722129).

Almost surely, 2^8211444257 is an apocalyptic number.

It is an amenable number.

8211444257 is a deficient number, since it is larger than the sum of its proper divisors (1).

8211444257 is an equidigital number, since it uses as much as digits as its factorization.

8211444257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71680, while the sum is 38.

The square root of 8211444257 is about 90617.0196872530. The cubic root of 8211444257 is about 2017.4673563609.

The spelling of 8211444257 in words is "eight billion, two hundred eleven million, four hundred forty-four thousand, two hundred fifty-seven".