6511971 has 4 divisors (see below), whose sum is σ = 8682632. Its totient is φ = 4341312.

The previous prime is 6511961. The next prime is 6511997. The reversal of 6511971 is 1791156.

6511971 is nontrivially palindromic in base 2.

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

It is a de Polignac number, because none of the positive numbers 2^k-6511971 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6511961) 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 3 ways as a sum of consecutive naturals, for example, 1085326 + ... + 1085331.

It is an arithmetic number, because the mean of its divisors is an integer number (2170658).

Almost surely, 2^6511971 is an apocalyptic number.

6511971 is a deficient number, since it is larger than the sum of its proper divisors (2170661).

6511971 is a wasteful number, since it uses less digits than its factorization.

6511971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170660.

The product of its digits is 1890, while the sum is 30.

The square root of 6511971 is about 2551.8563831062. The cubic root of 6511971 is about 186.7400565306.

The spelling of 6511971 in words is "six million, five hundred eleven thousand, nine hundred seventy-one".