6491271 has 4 divisors (see below), whose sum is σ = 8655032. Its totient is φ = 4327512.

The previous prime is 6491257. The next prime is 6491299. The reversal of 6491271 is 1721946.

It is a happy number.

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

It is not a de Polignac number, because 6491271 - 2⁶ = 6491207 is a prime.

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 (6491231) 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, 1081876 + ... + 1081881.

It is an arithmetic number, because the mean of its divisors is an integer number (2163758).

Almost surely, 2^6491271 is an apocalyptic number.

6491271 is a deficient number, since it is larger than the sum of its proper divisors (2163761).

6491271 is a wasteful number, since it uses less digits than its factorization.

6491271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2163760.

The product of its digits is 3024, while the sum is 30.

The square root of 6491271 is about 2547.7972839298. The cubic root of 6491271 is about 186.5419791603.

The spelling of 6491271 in words is "six million, four hundred ninety-one thousand, two hundred seventy-one".