6647171 has 4 divisors (see below), whose sum is σ = 6691344. Its totient is φ = 6603000.

The previous prime is 6647167. The next prime is 6647189. The reversal of 6647171 is 1717466.

6647171 = T₂₁₈ + T₂₁₉ + ... + T₃₆₈.

It is a happy number.

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 6647171 - 2² = 6647167 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6647111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21860 + ... + 22161.

It is an arithmetic number, because the mean of its divisors is an integer number (1672836).

Almost surely, 2^6647171 is an apocalyptic number.

6647171 is a deficient number, since it is larger than the sum of its proper divisors (44173).

6647171 is a wasteful number, since it uses less digits than its factorization.

6647171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44172.

The product of its digits is 7056, while the sum is 32.

The square root of 6647171 is about 2578.2108137233. The cubic root of 6647171 is about 188.0235654027.

The spelling of 6647171 in words is "six million, six hundred forty-seven thousand, one hundred seventy-one".