8004228581 has 2 divisors, whose sum is σ = 8004228582. Its totient is φ = 8004228580.

The previous prime is 8004228577. The next prime is 8004228623. The reversal of 8004228581 is 1858224008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7324792225 + 679436356 = 85585^2 + 26066^2 .

It is a cyclic number.

It is not a de Polignac number, because 8004228581 - 2² = 8004228577 is a prime.

It is a super-2 number, since 2×8004228581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8004228181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4002114290 + 4002114291.

It is an arithmetic number, because the mean of its divisors is an integer number (4002114291).

Almost surely, 2^8004228581 is an apocalyptic number.

It is an amenable number.

8004228581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8004228581 is an equidigital number, since it uses as much as digits as its factorization.

8004228581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40960, while the sum is 38.

The square root of 8004228581 is about 89466.3544635636. The cubic root of 8004228581 is about 2000.3523196818.

The spelling of 8004228581 in words is "eight billion, four million, two hundred twenty-eight thousand, five hundred eighty-one".