7220581 has 2 divisors, whose sum is σ = 7220582. Its totient is φ = 7220580.

The previous prime is 7220573. The next prime is 7220611. The reversal of 7220581 is 1850227.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4879681 + 2340900 = 2209^2 + 1530^2 .

It is an emirp because it is prime and its reverse (1850227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7220581 - 2³ = 7220573 is a prime.

It is a super-2 number, since 2×7220581² = 104273579955122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7220531) 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, 3610290 + 3610291.

It is an arithmetic number, because the mean of its divisors is an integer number (3610291).

Almost surely, 2^7220581 is an apocalyptic number.

It is an amenable number.

7220581 is a deficient number, since it is larger than the sum of its proper divisors (1).

7220581 is an equidigital number, since it uses as much as digits as its factorization.

7220581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 7220581 is about 2687.1138792392. The cubic root of 7220581 is about 193.2816901963.

The spelling of 7220581 in words is "seven million, two hundred twenty thousand, five hundred eighty-one".