545609 has 2 divisors, whose sum is σ = 545610. Its totient is φ = 545608.

The previous prime is 545599. The next prime is 545617. The reversal of 545609 is 906545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 529984 + 15625 = 728^2 + 125^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (547609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272804 + 272805.

It is an arithmetic number, because the mean of its divisors is an integer number (272805).

2⁵⁴⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

545609 is a deficient number, since it is larger than the sum of its proper divisors (1).

545609 is an equidigital number, since it uses as much as digits as its factorization.

545609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 545609 is about 738.6535046962. The cubic root of 545609 is about 81.7135054556.

The spelling of 545609 in words is "five hundred forty-five thousand, six hundred nine".