6561794 has 4 divisors (see below), whose sum is σ = 9842694. Its totient is φ = 3280896.

The previous prime is 6561791. The next prime is 6561809. The reversal of 6561794 is 4971656.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4774225 + 1787569 = 2185^2 + 1337^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6561791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1640447 + ... + 1640450.

Almost surely, 2^6561794 is an apocalyptic number.

6561794 is a deficient number, since it is larger than the sum of its proper divisors (3280900).

6561794 is a wasteful number, since it uses less digits than its factorization.

6561794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3280899.

The product of its digits is 45360, while the sum is 38.

The square root of 6561794 is about 2561.5998906933. The cubic root of 6561794 is about 187.2150956062.

The spelling of 6561794 in words is "six million, five hundred sixty-one thousand, seven hundred ninety-four".