545659561 has 2 divisors, whose sum is σ = 545659562. Its totient is φ = 545659560.

The previous prime is 545659549. The next prime is 545659577. The reversal of 545659561 is 165956545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 540841536 + 4818025 = 23256^2 + 2195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545659561 is a prime.

It is not a weakly prime, because it can be changed into another prime (545659511) 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, 272829780 + 272829781.

It is an arithmetic number, because the mean of its divisors is an integer number (272829781).

Almost surely, 2^545659561 is an apocalyptic number.

It is an amenable number.

545659561 is a deficient number, since it is larger than the sum of its proper divisors (1).

545659561 is an equidigital number, since it uses as much as digits as its factorization.

545659561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810000, while the sum is 46.

The square root of 545659561 is about 23359.3570331035. The cubic root of 545659561 is about 817.1602947858.

The spelling of 545659561 in words is "five hundred forty-five million, six hundred fifty-nine thousand, five hundred sixty-one".