6881321 has 2 divisors, whose sum is σ = 6881322. Its totient is φ = 6881320.

The previous prime is 6881291. The next prime is 6881339. The reversal of 6881321 is 1231886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5125696 + 1755625 = 2264^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 6881321 - 2⁶ = 6881257 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is equal to p₄₆₉₀₉₁ and since 6881321 and 469091 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (6881341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3440660 + 3440661.

It is an arithmetic number, because the mean of its divisors is an integer number (3440661).

Almost surely, 2^6881321 is an apocalyptic number.

It is an amenable number.

6881321 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881321 is an equidigital number, since it uses as much as digits as its factorization.

6881321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 6881321 is about 2623.2272108988. The cubic root of 6881321 is about 190.2058802481.

The spelling of 6881321 in words is "six million, eight hundred eighty-one thousand, three hundred twenty-one".