6391671 has 32 divisors (see below), whose sum is σ = 10257408. Its totient is φ = 3488640.

The previous prime is 6391669. The next prime is 6391699. The reversal of 6391671 is 1761936.

It is not a de Polignac number, because 6391671 - 2¹ = 6391669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

6391671 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6391601) 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 31 ways as a sum of consecutive naturals, for example, 20005 + ... + 20321.

It is an arithmetic number, because the mean of its divisors is an integer number (320544).

Almost surely, 2^6391671 is an apocalyptic number.

6391671 is a deficient number, since it is larger than the sum of its proper divisors (3865737).

6391671 is a wasteful number, since it uses less digits than its factorization.

6391671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391.

The product of its digits is 6804, while the sum is 33.

The square root of 6391671 is about 2528.1754290397. The cubic root of 6391671 is about 185.5829771440.

The spelling of 6391671 in words is "six million, three hundred ninety-one thousand, six hundred seventy-one".