6561323 has 4 divisors (see below), whose sum is σ = 6653808. Its totient is φ = 6468840.

The previous prime is 6561319. The next prime is 6561383. The reversal of 6561323 is 3231656.

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 6561323 - 2² = 6561319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6561292 and 6561301.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46136 + ... + 46277.

It is an arithmetic number, because the mean of its divisors is an integer number (1663452).

Almost surely, 2^6561323 is an apocalyptic number.

6561323 is a deficient number, since it is larger than the sum of its proper divisors (92485).

6561323 is an equidigital number, since it uses as much as digits as its factorization.

6561323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92484.

The product of its digits is 3240, while the sum is 26.

The square root of 6561323 is about 2561.5079543113. The cubic root of 6561323 is about 187.2106161188.

Adding to 6561323 its reverse (3231656), we get a palindrome (9792979).

The spelling of 6561323 in words is "six million, five hundred sixty-one thousand, three hundred twenty-three".