6561946 has 16 divisors (see below), whose sum is σ = 10627200. Its totient is φ = 3029488.

The previous prime is 6561943. The next prime is 6561991. The reversal of 6561946 is 6491656.

It is not an unprimeable number, because it can be changed into a prime (6561941) 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, 1126 + ... + 3793.

It is an arithmetic number, because the mean of its divisors is an integer number (664200).

Almost surely, 2^6561946 is an apocalyptic number.

6561946 is a deficient number, since it is larger than the sum of its proper divisors (4065254).

6561946 is a wasteful number, since it uses less digits than its factorization.

6561946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4973.

The product of its digits is 38880, while the sum is 37.

The square root of 6561946 is about 2561.6295594797. The cubic root of 6561946 is about 187.2165411699.

The spelling of 6561946 in words is "six million, five hundred sixty-one thousand, nine hundred forty-six".