6881389 has 2 divisors, whose sum is σ = 6881390. Its totient is φ = 6881388.

The previous prime is 6881387. The next prime is 6881417. The reversal of 6881389 is 9831886.

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., 5368489 + 1512900 = 2317^2 + 1230^2 .

It is a cyclic number.

It is not a de Polignac number, because 6881389 - 2¹ = 6881387 is a prime.

Together with 6881387, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 6³ + 8³ + 8³ + 1 + 3³ + 8⁷ + 9⁷ .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6881383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3440694 + 3440695.

It is an arithmetic number, because the mean of its divisors is an integer number (3440695).

Almost surely, 2^6881389 is an apocalyptic number.

It is an amenable number.

6881389 is a deficient number, since it is larger than the sum of its proper divisors (1).

6881389 is an equidigital number, since it uses as much as digits as its factorization.

6881389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 43.

The square root of 6881389 is about 2623.2401720010. The cubic root of 6881389 is about 190.2065067730.

The spelling of 6881389 in words is "six million, eight hundred eighty-one thousand, three hundred eighty-nine".