6331691 has 2 divisors, whose sum is σ = 6331692. Its totient is φ = 6331690.

The previous prime is 6331679. The next prime is 6331723. The reversal of 6331691 is 1961336.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6331691 - 2¹⁴ = 6315307 is a prime.

It is not a weakly prime, because it can be changed into another prime (6331291) 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 as a sum of consecutive naturals, namely, 3165845 + 3165846.

It is an arithmetic number, because the mean of its divisors is an integer number (3165846).

Almost surely, 2^6331691 is an apocalyptic number.

6331691 is a deficient number, since it is larger than the sum of its proper divisors (1).

6331691 is an equidigital number, since it uses as much as digits as its factorization.

6331691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 29.

The square root of 6331691 is about 2516.2851587211. The cubic root of 6331691 is about 185.0006428027. Note that the first 3 decimals are identical.

The spelling of 6331691 in words is "six million, three hundred thirty-one thousand, six hundred ninety-one".