7221569 has 2 divisors, whose sum is σ = 7221570. Its totient is φ = 7221568.

The previous prime is 7221547. The next prime is 7221587. The reversal of 7221569 is 9651227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7219969 + 1600 = 2687^2 + 40^2 .

It is a cyclic number.

It is not a de Polignac number, because 7221569 - 2¹⁶ = 7156033 is a prime.

It is a super-2 number, since 2×7221569² = 104302117643522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7221509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3610784 + 3610785.

It is an arithmetic number, because the mean of its divisors is an integer number (3610785).

Almost surely, 2^7221569 is an apocalyptic number.

It is an amenable number.

7221569 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221569 is an equidigital number, since it uses as much as digits as its factorization.

7221569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7560, while the sum is 32.

The square root of 7221569 is about 2687.2977133172. The cubic root of 7221569 is about 193.2905054426.

The spelling of 7221569 in words is "seven million, two hundred twenty-one thousand, five hundred sixty-nine".