545121209 has 2 divisors, whose sum is σ = 545121210. Its totient is φ = 545121208.

The previous prime is 545121169. The next prime is 545121253. The reversal of 545121209 is 902121545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 367565584 + 177555625 = 19172^2 + 13325^2 .

It is a cyclic number.

It is not a de Polignac number, because 545121209 - 2¹⁶ = 545055673 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (545121289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272560604 + 272560605.

It is an arithmetic number, because the mean of its divisors is an integer number (272560605).

Almost surely, 2^545121209 is an apocalyptic number.

It is an amenable number.

545121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

545121209 is an equidigital number, since it uses as much as digits as its factorization.

545121209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 545121209 is about 23347.8309270904. The cubic root of 545121209 is about 816.8914674400.

The spelling of 545121209 in words is "five hundred forty-five million, one hundred twenty-one thousand, two hundred nine".