6561873 has 12 divisors (see below), whose sum is σ = 9528948. Its totient is φ = 4351200.

The previous prime is 6561871. The next prime is 6561883. The reversal of 6561873 is 3781656.

It can be written as a sum of positive squares in 2 ways, for example, as 4981824 + 1580049 = 2232^2 + 1257^2 .

It is not a de Polignac number, because 6561873 - 2¹ = 6561871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6561871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 78 + ... + 3623.

It is an arithmetic number, because the mean of its divisors is an integer number (794079).

Almost surely, 2^6561873 is an apocalyptic number.

It is an amenable number.

6561873 is a deficient number, since it is larger than the sum of its proper divisors (2967075).

6561873 is a wasteful number, since it uses less digits than its factorization.

6561873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904 (or 3901 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 6561873 is about 2561.6153106975. The cubic root of 6561873 is about 187.2158469217.

The spelling of 6561873 in words is "six million, five hundred sixty-one thousand, eight hundred seventy-three".