6998209 has 2 divisors, whose sum is σ = 6998210. Its totient is φ = 6998208.

The previous prime is 6998197. The next prime is 6998221. The reversal of 6998209 is 9028996.

It is a balanced prime because it is at equal distance from previous prime (6998197) and next prime (6998221).

It can be written as a sum of positive squares in only one way, i.e., 6890625 + 107584 = 2625^2 + 328^2 .

It is a cyclic number.

It is not a de Polignac number, because 6998209 - 2⁵ = 6998177 is a prime.

6998209 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6998269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499104 + 3499105.

It is an arithmetic number, because the mean of its divisors is an integer number (3499105).

Almost surely, 2^6998209 is an apocalyptic number.

It is an amenable number.

6998209 is a deficient number, since it is larger than the sum of its proper divisors (1).

6998209 is an equidigital number, since it uses as much as digits as its factorization.

6998209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 6998209 is about 2645.4128222264. The cubic root of 6998209 is about 191.2768023154.

The spelling of 6998209 in words is "six million, nine hundred ninety-eight thousand, two hundred nine".