6566491 has 4 divisors (see below), whose sum is σ = 6575800. Its totient is φ = 6557184.

The previous prime is 6566489. The next prime is 6566503. The reversal of 6566491 is 1946656.

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 6566491 - 2¹ = 6566489 is a prime.

It is a Duffinian number.

6566491 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6566491.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6566291) 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, 3501 + ... + 5038.

It is an arithmetic number, because the mean of its divisors is an integer number (1643950).

Almost surely, 2^6566491 is an apocalyptic number.

6566491 is a deficient number, since it is larger than the sum of its proper divisors (9309).

6566491 is an equidigital number, since it uses as much as digits as its factorization.

6566491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9308.

The product of its digits is 38880, while the sum is 37.

The square root of 6566491 is about 2562.5165365320. The cubic root of 6566491 is about 187.2597551191.

The spelling of 6566491 in words is "six million, five hundred sixty-six thousand, four hundred ninety-one".