6331891 has 4 divisors (see below), whose sum is σ = 6339384. Its totient is φ = 6324400.

The previous prime is 6331873. The next prime is 6331903. The reversal of 6331891 is 1981336.

6331891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6331891 - 2⁵ = 6331859 is a prime.

It is a super-4 number, since 4×6331891⁴ (a number of 28 digits) contains 4444 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6331291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2290 + ... + 4231.

It is an arithmetic number, because the mean of its divisors is an integer number (1584846).

Almost surely, 2^6331891 is an apocalyptic number.

6331891 is a deficient number, since it is larger than the sum of its proper divisors (7493).

6331891 is an equidigital number, since it uses as much as digits as its factorization.

6331891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7492.

The product of its digits is 3888, while the sum is 31.

The square root of 6331891 is about 2516.3248995311. The cubic root of 6331891 is about 185.0025906625.

The spelling of 6331891 in words is "six million, three hundred thirty-one thousand, eight hundred ninety-one".