8218481 has 2 divisors, whose sum is σ = 8218482. Its totient is φ = 8218480.

The previous prime is 8218459. The next prime is 8218489. The reversal of 8218481 is 1848128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8065600 + 152881 = 2840^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 8218481 - 2¹⁴ = 8202097 is a prime.

It is a super-2 number, since 2×8218481² = 135086859894722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8218489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4109240 + 4109241.

It is an arithmetic number, because the mean of its divisors is an integer number (4109241).

Almost surely, 2^8218481 is an apocalyptic number.

It is an amenable number.

8218481 is a deficient number, since it is larger than the sum of its proper divisors (1).

8218481 is an equidigital number, since it uses as much as digits as its factorization.

8218481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4096, while the sum is 32.

The square root of 8218481 is about 2866.7893190815. The cubic root of 8218481 is about 201.8043476940.

The spelling of 8218481 in words is "eight million, two hundred eighteen thousand, four hundred eighty-one".