9090209 has 4 divisors (see below), whose sum is σ = 9096240. Its totient is φ = 9084180.

The previous prime is 9090203. The next prime is 9090217. The reversal of 9090209 is 9020909.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9020909 = 163 ⋅55343.

It is a cyclic number.

It is not a de Polignac number, because 9090209 - 2¹² = 9086113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9090203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1502 + ... + 4520.

It is an arithmetic number, because the mean of its divisors is an integer number (2274060).

Almost surely, 2^9090209 is an apocalyptic number.

It is an amenable number.

9090209 is a deficient number, since it is larger than the sum of its proper divisors (6031).

9090209 is a wasteful number, since it uses less digits than its factorization.

9090209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6030.

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 9090209 is about 3014.9973465992. The cubic root of 9090209 is about 208.7010446114.

The spelling of 9090209 in words is "nine million, ninety thousand, two hundred nine".