6811391 has 4 divisors (see below), whose sum is σ = 6865152. Its totient is φ = 6757632.

The previous prime is 6811369. The next prime is 6811393. The reversal of 6811391 is 1931186.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6811391 - 2⁶ = 6811327 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6811393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26690 + ... + 26943.

It is an arithmetic number, because the mean of its divisors is an integer number (1716288).

Almost surely, 2^6811391 is an apocalyptic number.

6811391 is a deficient number, since it is larger than the sum of its proper divisors (53761).

6811391 is a wasteful number, since it uses less digits than its factorization.

6811391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53760.

The product of its digits is 1296, while the sum is 29.

The square root of 6811391 is about 2609.8641727109. The cubic root of 6811391 is about 189.5593759956.

The spelling of 6811391 in words is "six million, eight hundred eleven thousand, three hundred ninety-one".