9109920209 has 4 divisors (see below), whose sum is σ = 9810683316. Its totient is φ = 8409157104.

The previous prime is 9109920199. The next prime is 9109920223. The reversal of 9109920209 is 9020299019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9020299019 = 22549 ⋅400031.

It can be written as a sum of positive squares in 2 ways, for example, as 3196771600 + 5913148609 = 56540^2 + 76897^2 .

It is a cyclic number.

It is not a de Polignac number, because 9109920209 - 2²⁰ = 9108871633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9109920289) 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, 350381534 + ... + 350381559.

It is an arithmetic number, because the mean of its divisors is an integer number (2452670829).

Almost surely, 2^9109920209 is an apocalyptic number.

It is an amenable number.

9109920209 is a deficient number, since it is larger than the sum of its proper divisors (700763107).

9109920209 is a wasteful number, since it uses less digits than its factorization.

9109920209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700763106.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 9109920209 is about 95445.9020021289. The cubic root of 9109920209 is about 2088.5178482241.

The spelling of 9109920209 in words is "nine billion, one hundred nine million, nine hundred twenty thousand, two hundred nine".