4545209 has 2 divisors, whose sum is σ = 4545210. Its totient is φ = 4545208.

The previous prime is 4545197. The next prime is 4545223. The reversal of 4545209 is 9025454.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4515625 + 29584 = 2125^2 + 172^2 .

It is a cyclic number.

It is not a de Polignac number, because 4545209 - 2⁴ = 4545193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4545259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2272604 + 2272605.

It is an arithmetic number, because the mean of its divisors is an integer number (2272605).

Almost surely, 2^4545209 is an apocalyptic number.

It is an amenable number.

4545209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4545209 is an equidigital number, since it uses as much as digits as its factorization.

4545209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 4545209 is about 2131.9495772649. The cubic root of 4545209 is about 165.6473983711.

It can be divided in two parts, 45 and 45209, that added together give a palindrome (45254).

The spelling of 4545209 in words is "four million, five hundred forty-five thousand, two hundred nine".