4545509 has 2 divisors, whose sum is σ = 4545510. Its totient is φ = 4545508.

The previous prime is 4545479. The next prime is 4545521. The reversal of 4545509 is 9055454.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3940225 + 605284 = 1985^2 + 778^2 .

It is a cyclic number.

It is not a de Polignac number, because 4545509 - 2¹⁶ = 4479973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4545599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2272754 + 2272755.

It is an arithmetic number, because the mean of its divisors is an integer number (2272755).

Almost surely, 2^4545509 is an apocalyptic number.

It is an amenable number.

4545509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4545509 is an equidigital number, since it uses as much as digits as its factorization.

4545509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 4545509 is about 2132.0199342408. The cubic root of 4545509 is about 165.6510427305.

It can be divided in two parts, 45 and 45509, that added together give a palindrome (45554).

The spelling of 4545509 in words is "four million, five hundred forty-five thousand, five hundred nine".