6561271 has 4 divisors (see below), whose sum is σ = 6721344. Its totient is φ = 6401200.

The previous prime is 6561259. The next prime is 6561277. The reversal of 6561271 is 1721656.

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

It is a cyclic number.

It is not a de Polignac number, because 6561271 - 2⁷ = 6561143 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 (6561277) 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, 79975 + ... + 80056.

It is an arithmetic number, because the mean of its divisors is an integer number (1680336).

Almost surely, 2^6561271 is an apocalyptic number.

6561271 is a deficient number, since it is larger than the sum of its proper divisors (160073).

6561271 is a wasteful number, since it uses less digits than its factorization.

6561271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160072.

The product of its digits is 2520, while the sum is 28.

The square root of 6561271 is about 2561.4978040201. The cubic root of 6561271 is about 187.2101215550.

The spelling of 6561271 in words is "six million, five hundred sixty-one thousand, two hundred seventy-one".