6841991 has 4 divisors (see below), whose sum is σ = 7368312. Its totient is φ = 6315672.

The previous prime is 6841987. The next prime is 6841993. The reversal of 6841991 is 1991486.

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 6841991 - 2² = 6841987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6841993) 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 in 3 ways as a sum of consecutive naturals, for example, 263141 + ... + 263166.

It is an arithmetic number, because the mean of its divisors is an integer number (1842078).

Almost surely, 2^6841991 is an apocalyptic number.

6841991 is a deficient number, since it is larger than the sum of its proper divisors (526321).

6841991 is a wasteful number, since it uses less digits than its factorization.

6841991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526320.

The product of its digits is 15552, while the sum is 38.

The square root of 6841991 is about 2615.7199773676. The cubic root of 6841991 is about 189.8428155209.

The spelling of 6841991 in words is "six million, eight hundred forty-one thousand, nine hundred ninety-one".