9090509 has 2 divisors, whose sum is σ = 9090510. Its totient is φ = 9090508.

The previous prime is 9090503. The next prime is 9090517. The reversal of 9090509 is 9050909.

9090509 is nontrivially palindromic in base 14.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5929225 + 3161284 = 2435^2 + 1778^2 .

It is a cyclic number.

It is not a de Polignac number, because 9090509 - 2¹⁶ = 9024973 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9090503) 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, 4545254 + 4545255.

It is an arithmetic number, because the mean of its divisors is an integer number (4545255).

Almost surely, 2^9090509 is an apocalyptic number.

It is an amenable number.

9090509 is a deficient number, since it is larger than the sum of its proper divisors (1).

9090509 is an equidigital number, since it uses as much as digits as its factorization.

9090509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 9090509 is about 3015.0470974763. The cubic root of 9090509 is about 208.7033404745.

The spelling of 9090509 in words is "nine million, ninety thousand, five hundred nine".