7221869 has 2 divisors, whose sum is σ = 7221870. Its totient is φ = 7221868.

The previous prime is 7221859. The next prime is 7221871. The reversal of 7221869 is 9681227.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5466244 + 1755625 = 2338^2 + 1325^2 .

It is an emirp because it is prime and its reverse (9681227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7221869 - 2¹⁶ = 7156333 is a prime.

It is a super-2 number, since 2×7221869² = 104310783706322, which contains 22 as substring.

Together with 7221871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7221829) 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, 3610934 + 3610935.

It is an arithmetic number, because the mean of its divisors is an integer number (3610935).

Almost surely, 2^7221869 is an apocalyptic number.

It is an amenable number.

7221869 is a deficient number, since it is larger than the sum of its proper divisors (1).

7221869 is an equidigital number, since it uses as much as digits as its factorization.

7221869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 7221869 is about 2687.3535308924. The cubic root of 7221869 is about 193.2931819777.

The spelling of 7221869 in words is "seven million, two hundred twenty-one thousand, eight hundred sixty-nine".