7985221 has 2 divisors, whose sum is σ = 7985222. Its totient is φ = 7985220.

The previous prime is 7985203. The next prime is 7985227. The reversal of 7985221 is 1225897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4884100 + 3101121 = 2210^2 + 1761^2 .

It is an emirp because it is prime and its reverse (1225897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7985221 - 2⁷ = 7985093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7985227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3992610 + 3992611.

It is an arithmetic number, because the mean of its divisors is an integer number (3992611).

Almost surely, 2^7985221 is an apocalyptic number.

It is an amenable number.

7985221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7985221 is an equidigital number, since it uses as much as digits as its factorization.

7985221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 34.

The square root of 7985221 is about 2825.8133342456. The cubic root of 7985221 is about 199.8767657489.

The spelling of 7985221 in words is "seven million, nine hundred eighty-five thousand, two hundred twenty-one".