8220581 has 2 divisors, whose sum is σ = 8220582. Its totient is φ = 8220580.

The previous prime is 8220577. The next prime is 8220631. The reversal of 8220581 is 1850228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7107556 + 1113025 = 2666^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 8220581 - 2² = 8220577 is a prime.

It is a super-2 number, since 2×8220581² = 135155903955122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8220581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8220551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4110290 + 4110291.

It is an arithmetic number, because the mean of its divisors is an integer number (4110291).

Almost surely, 2^8220581 is an apocalyptic number.

It is an amenable number.

8220581 is a deficient number, since it is larger than the sum of its proper divisors (1).

8220581 is an equidigital number, since it uses as much as digits as its factorization.

8220581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 26.

The square root of 8220581 is about 2867.1555590864. The cubic root of 8220581 is about 201.8215346916.

The spelling of 8220581 in words is "eight million, two hundred twenty thousand, five hundred eighty-one".