7145209 has 2 divisors, whose sum is σ = 7145210. Its totient is φ = 7145208.

The previous prime is 7145191. The next prime is 7145231. The reversal of 7145209 is 9025417.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7139584 + 5625 = 2672^2 + 75^2 .

It is an emirp because it is prime and its reverse (9025417) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7145209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7145239) 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, 3572604 + 3572605.

It is an arithmetic number, because the mean of its divisors is an integer number (3572605).

Almost surely, 2^7145209 is an apocalyptic number.

It is an amenable number.

7145209 is a deficient number, since it is larger than the sum of its proper divisors (1).

7145209 is an equidigital number, since it uses as much as digits as its factorization.

7145209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 7145209 is about 2673.0523750948. The cubic root of 7145209 is about 192.6068131562.

The spelling of 7145209 in words is "seven million, one hundred forty-five thousand, two hundred nine".