6998221 has 2 divisors, whose sum is σ = 6998222. Its totient is φ = 6998220.

The previous prime is 6998209. The next prime is 6998261. The reversal of 6998221 is 1228996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6734025 + 264196 = 2595^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 6998221 - 2⁷ = 6998093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6998261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3499110 + 3499111.

It is an arithmetic number, because the mean of its divisors is an integer number (3499111).

Almost surely, 2^6998221 is an apocalyptic number.

It is an amenable number.

6998221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6998221 is an equidigital number, since it uses as much as digits as its factorization.

6998221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 6998221 is about 2645.4150903025. The cubic root of 6998221 is about 191.2769116444.

The spelling of 6998221 in words is "six million, nine hundred ninety-eight thousand, two hundred twenty-one".