6564981 has 4 divisors (see below), whose sum is σ = 8753312. Its totient is φ = 4376652.

The previous prime is 6564977. The next prime is 6564983. The reversal of 6564981 is 1894656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6564981 - 2² = 6564977 is a prime.

It is a super-2 number, since 2×6564981² = 86197951060722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6564983) 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, 1094161 + ... + 1094166.

It is an arithmetic number, because the mean of its divisors is an integer number (2188328).

Almost surely, 2^6564981 is an apocalyptic number.

It is an amenable number.

6564981 is a deficient number, since it is larger than the sum of its proper divisors (2188331).

6564981 is a wasteful number, since it uses less digits than its factorization.

6564981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188330.

The product of its digits is 51840, while the sum is 39.

The square root of 6564981 is about 2562.2218873470. The cubic root of 6564981 is about 187.2454002220.

The spelling of 6564981 in words is "six million, five hundred sixty-four thousand, nine hundred eighty-one".