10909209 has 4 divisors (see below), whose sum is σ = 14545616. Its totient is φ = 7272804.

The previous prime is 10909181. The next prime is 10909231. The reversal of 10909209 is 90290901.

10909209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 10909209 - 2⁷ = 10909081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10909259) 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, 1818199 + ... + 1818204.

It is an arithmetic number, because the mean of its divisors is an integer number (3636404).

Almost surely, 2^10909209 is an apocalyptic number.

It is an amenable number.

10909209 is a deficient number, since it is larger than the sum of its proper divisors (3636407).

10909209 is an equidigital number, since it uses as much as digits as its factorization.

10909209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636406.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 10909209 is about 3302.9091722298. The cubic root of 10909209 is about 221.7844470525.

The spelling of 10909209 in words is "ten million, nine hundred nine thousand, two hundred nine".