6513971 has 4 divisors (see below), whose sum is σ = 6519552. Its totient is φ = 6508392.

The previous prime is 6513953. The next prime is 6513973. The reversal of 6513971 is 1793156.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6513971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6513973) 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, 296 + ... + 3621.

It is an arithmetic number, because the mean of its divisors is an integer number (1629888).

Almost surely, 2^6513971 is an apocalyptic number.

6513971 is a deficient number, since it is larger than the sum of its proper divisors (5581).

6513971 is a wasteful number, since it uses less digits than its factorization.

6513971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580.

The product of its digits is 5670, while the sum is 32.

The square root of 6513971 is about 2552.2482246051. The cubic root of 6513971 is about 186.7591721913.

The spelling of 6513971 in words is "six million, five hundred thirteen thousand, nine hundred seventy-one".