6647971 has 4 divisors (see below), whose sum is σ = 7252344. Its totient is φ = 6043600.

The previous prime is 6647959. The next prime is 6647983. The reversal of 6647971 is 1797466.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6647959) and next prime (6647983).

It is a cyclic number.

It is not a de Polignac number, because 6647971 - 2⁵ = 6647939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6647911) 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, 302170 + ... + 302191.

It is an arithmetic number, because the mean of its divisors is an integer number (1813086).

Almost surely, 2^6647971 is an apocalyptic number.

6647971 is a deficient number, since it is larger than the sum of its proper divisors (604373).

6647971 is a wasteful number, since it uses less digits than its factorization.

6647971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604372.

The product of its digits is 63504, while the sum is 40.

The square root of 6647971 is about 2578.3659554066. The cubic root of 6647971 is about 188.0311081011.

The spelling of 6647971 in words is "six million, six hundred forty-seven thousand, nine hundred seventy-one".