8215841 has 2 divisors, whose sum is σ = 8215842. Its totient is φ = 8215840.

The previous prime is 8215829. The next prime is 8215843. The reversal of 8215841 is 1485128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7134241 + 1081600 = 2671^2 + 1040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8215841 is a prime.

Together with 8215843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8215843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4107920 + 4107921.

It is an arithmetic number, because the mean of its divisors is an integer number (4107921).

Almost surely, 2^8215841 is an apocalyptic number.

It is an amenable number.

8215841 is a deficient number, since it is larger than the sum of its proper divisors (1).

8215841 is an equidigital number, since it uses as much as digits as its factorization.

8215841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2560, while the sum is 29.

The square root of 8215841 is about 2866.3288366829. The cubic root of 8215841 is about 201.7827370284.

The spelling of 8215841 in words is "eight million, two hundred fifteen thousand, eight hundred forty-one".