6509491 has 2 divisors, whose sum is σ = 6509492. Its totient is φ = 6509490.

The previous prime is 6509449. The next prime is 6509501. The reversal of 6509491 is 1949056.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6509491 - 2⁹ = 6508979 is a prime.

It is not a weakly prime, because it can be changed into another prime (6509791) 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 as a sum of consecutive naturals, namely, 3254745 + 3254746.

It is an arithmetic number, because the mean of its divisors is an integer number (3254746).

Almost surely, 2^6509491 is an apocalyptic number.

6509491 is a deficient number, since it is larger than the sum of its proper divisors (1).

6509491 is an equidigital number, since it uses as much as digits as its factorization.

6509491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 6509491 is about 2551.3704160705. The cubic root of 6509491 is about 186.7163476748.

The spelling of 6509491 in words is "six million, five hundred nine thousand, four hundred ninety-one".