4538509 has 2 divisors, whose sum is σ = 4538510. Its totient is φ = 4538508.

The previous prime is 4538503. The next prime is 4538519. The reversal of 4538509 is 9058354.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2550409 + 1988100 = 1597^2 + 1410^2 .

It is a cyclic number.

It is not a de Polignac number, because 4538509 - 2⁵ = 4538477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4538503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2269254 + 2269255.

It is an arithmetic number, because the mean of its divisors is an integer number (2269255).

Almost surely, 2^4538509 is an apocalyptic number.

It is an amenable number.

4538509 is a deficient number, since it is larger than the sum of its proper divisors (1).

4538509 is an equidigital number, since it uses as much as digits as its factorization.

4538509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 4538509 is about 2130.3776660489. The cubic root of 4538509 is about 165.5659658601.

The spelling of 4538509 in words is "four million, five hundred thirty-eight thousand, five hundred nine".