3206561 has 2 divisors, whose sum is σ = 3206562. Its totient is φ = 3206560.

The previous prime is 3206551. The next prime is 3206563. The reversal of 3206561 is 1656023.

3206561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2689600 + 516961 = 1640^2 + 719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3206561 is a prime.

Together with 3206563, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3206563) 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 as a sum of consecutive naturals, namely, 1603280 + 1603281.

It is an arithmetic number, because the mean of its divisors is an integer number (1603281).

Almost surely, 2^3206561 is an apocalyptic number.

It is an amenable number.

3206561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3206561 is an equidigital number, since it uses as much as digits as its factorization.

3206561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 3206561 is about 1790.6872982182. The cubic root of 3206561 is about 147.4619034045.

The spelling of 3206561 in words is "three million, two hundred six thousand, five hundred sixty-one".