6561005 has 8 divisors (see below), whose sum is σ = 8589024. Its totient is φ = 4771600.

The previous prime is 6561001. The next prime is 6561007. The reversal of 6561005 is 5001656.

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

It is not a de Polignac number, because 6561005 - 2² = 6561001 is a prime.

It is a super-2 number, since 2×6561005² = 86093573220050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6561001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59591 + ... + 59700.

It is an arithmetic number, because the mean of its divisors is an integer number (1073628).

Almost surely, 2^6561005 is an apocalyptic number.

It is an amenable number.

6561005 is a deficient number, since it is larger than the sum of its proper divisors (2028019).

6561005 is a wasteful number, since it uses less digits than its factorization.

6561005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119307.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 6561005 is about 2561.4458807478. The cubic root of 6561005 is about 187.2075916303.

It can be divided in two parts, 656 and 1005, that added together give a palindrome (1661).

The spelling of 6561005 in words is "six million, five hundred sixty-one thousand, five".