6643271 has 8 divisors (see below), whose sum is σ = 6840288. Its totient is φ = 6448000.

The previous prime is 6643261. The next prime is 6643283. The reversal of 6643271 is 1723466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6643271 - 2¹⁴ = 6626887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643201) 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 in 7 ways as a sum of consecutive naturals, for example, 12491 + ... + 13011.

It is an arithmetic number, because the mean of its divisors is an integer number (855036).

Almost surely, 2^6643271 is an apocalyptic number.

6643271 is a deficient number, since it is larger than the sum of its proper divisors (197017).

6643271 is a wasteful number, since it uses less digits than its factorization.

6643271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873.

The product of its digits is 6048, while the sum is 29.

The square root of 6643271 is about 2577.4543642905. The cubic root of 6643271 is about 187.9867860790.

It can be divided in two parts, 6643 and 271, that multiplied together give a triangular number (1800253 = T₁₈₉₇).

The spelling of 6643271 in words is "six million, six hundred forty-three thousand, two hundred seventy-one".