7122209 has 2 divisors, whose sum is σ = 7122210. Its totient is φ = 7122208.

The previous prime is 7122187. The next prime is 7122253. The reversal of 7122209 is 9022217.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7006609 + 115600 = 2647^2 + 340^2 .

It is a cyclic number.

It is not a de Polignac number, because 7122209 - 2¹² = 7118113 is a prime.

It is a super-2 number, since 2×7122209² = 101451722079362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7122289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3561104 + 3561105.

It is an arithmetic number, because the mean of its divisors is an integer number (3561105).

Almost surely, 2^7122209 is an apocalyptic number.

It is an amenable number.

7122209 is a deficient number, since it is larger than the sum of its proper divisors (1).

7122209 is an equidigital number, since it uses as much as digits as its factorization.

7122209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 7122209 is about 2668.7467095998. The cubic root of 7122209 is about 192.3999277464.

The spelling of 7122209 in words is "seven million, one hundred twenty-two thousand, two hundred nine".