6416561 has 4 divisors (see below), whose sum is σ = 6423552. Its totient is φ = 6409572.

The previous prime is 6416539. The next prime is 6416567. The reversal of 6416561 is 1656146.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6416561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6416567) 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 3 ways as a sum of consecutive naturals, for example, 1865 + ... + 4038.

It is an arithmetic number, because the mean of its divisors is an integer number (1605888).

Almost surely, 2^6416561 is an apocalyptic number.

It is an amenable number.

6416561 is a deficient number, since it is larger than the sum of its proper divisors (6991).

6416561 is a wasteful number, since it uses less digits than its factorization.

6416561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6990.

The product of its digits is 4320, while the sum is 29.

The square root of 6416561 is about 2533.0931684405. The cubic root of 6416561 is about 185.8235598945.

The spelling of 6416561 in words is "six million, four hundred sixteen thousand, five hundred sixty-one".