545606209 has 2 divisors, whose sum is σ = 545606210. Its totient is φ = 545606208.

The previous prime is 545606183. The next prime is 545606249. The reversal of 545606209 is 902606545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286557184 + 259049025 = 16928^2 + 16095^2 .

It is a cyclic number.

It is not a de Polignac number, because 545606209 - 2¹¹ = 545604161 is a prime.

It is a super-2 number, since 2×545606209² = 595372270598703362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (545606249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272803104 + 272803105.

It is an arithmetic number, because the mean of its divisors is an integer number (272803105).

Almost surely, 2^545606209 is an apocalyptic number.

It is an amenable number.

545606209 is a deficient number, since it is larger than the sum of its proper divisors (1).

545606209 is an equidigital number, since it uses as much as digits as its factorization.

545606209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 545606209 is about 23358.2150217006. The cubic root of 545606209 is about 817.1336612337.

The spelling of 545606209 in words is "five hundred forty-five million, six hundred six thousand, two hundred nine".