6321561 has 8 divisors (see below), whose sum is σ = 8656704. Its totient is φ = 4100400.

The previous prime is 6321521. The next prime is 6321563. The reversal of 6321561 is 1651236.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6321561 - 2¹¹ = 6319513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6321563) 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 7 ways as a sum of consecutive naturals, for example, 28365 + ... + 28586.

It is an arithmetic number, because the mean of its divisors is an integer number (1082088).

Almost surely, 2^6321561 is an apocalyptic number.

It is an amenable number.

6321561 is a deficient number, since it is larger than the sum of its proper divisors (2335143).

6321561 is a wasteful number, since it uses less digits than its factorization.

6321561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56991.

The product of its digits is 1080, while the sum is 24.

The square root of 6321561 is about 2514.2714650570. The cubic root of 6321561 is about 184.9019300035.

Adding to 6321561 its reverse (1651236), we get a palindrome (7972797).

The spelling of 6321561 in words is "six million, three hundred twenty-one thousand, five hundred sixty-one".