6506891 has 2 divisors, whose sum is σ = 6506892. Its totient is φ = 6506890.

The previous prime is 6506887. The next prime is 6506893. The reversal of 6506891 is 1986056.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6506891 - 2² = 6506887 is a prime.

Together with 6506893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6506893) 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, 3253445 + 3253446.

It is an arithmetic number, because the mean of its divisors is an integer number (3253446).

Almost surely, 2^6506891 is an apocalyptic number.

6506891 is a deficient number, since it is larger than the sum of its proper divisors (1).

6506891 is an equidigital number, since it uses as much as digits as its factorization.

6506891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 6506891 is about 2550.8608350908. The cubic root of 6506891 is about 186.6914851496.

The spelling of 6506891 in words is "six million, five hundred six thousand, eight hundred ninety-one".