6561343 has 4 divisors (see below), whose sum is σ = 6668968. Its totient is φ = 6453720.

The previous prime is 6561319. The next prime is 6561383. The reversal of 6561343 is 3431656.

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 6561343 - 2⁵ = 6561311 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 (6561383) 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, 53721 + ... + 53842.

It is an arithmetic number, because the mean of its divisors is an integer number (1667242).

Almost surely, 2^6561343 is an apocalyptic number.

6561343 is a deficient number, since it is larger than the sum of its proper divisors (107625).

6561343 is a wasteful number, since it uses less digits than its factorization.

6561343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107624.

The product of its digits is 6480, while the sum is 28.

The square root of 6561343 is about 2561.5118582587. The cubic root of 6561343 is about 187.2108063349.

Adding to 6561343 its reverse (3431656), we get a palindrome (9992999).

It can be divided in two parts, 65613 and 43, that added together give a palindrome (65656).

The spelling of 6561343 in words is "six million, five hundred sixty-one thousand, three hundred forty-three".