6697321 has 2 divisors, whose sum is σ = 6697322. Its totient is φ = 6697320.

The previous prime is 6697319. The next prime is 6697331. The reversal of 6697321 is 1237966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6350400 + 346921 = 2520^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 6697321 - 2¹ = 6697319 is a prime.

Together with 6697319, it forms a pair of twin primes.

6697321 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (6697331) 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, 3348660 + 3348661.

It is an arithmetic number, because the mean of its divisors is an integer number (3348661).

Almost surely, 2^6697321 is an apocalyptic number.

It is an amenable number.

6697321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6697321 is an equidigital number, since it uses as much as digits as its factorization.

6697321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 34.

The square root of 6697321 is about 2587.9182753712. The cubic root of 6697321 is about 188.4952330831.

The spelling of 6697321 in words is "six million, six hundred ninety-seven thousand, three hundred twenty-one".