10855209 has 4 divisors (see below), whose sum is σ = 14473616. Its totient is φ = 7236804.

The previous prime is 10855199. The next prime is 10855211. The reversal of 10855209 is 90255801.

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 10855209 - 2⁸ = 10854953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10855219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1809199 + ... + 1809204.

It is an arithmetic number, because the mean of its divisors is an integer number (3618404).

Almost surely, 2^10855209 is an apocalyptic number.

It is an amenable number.

10855209 is a deficient number, since it is larger than the sum of its proper divisors (3618407).

10855209 is an equidigital number, since it uses as much as digits as its factorization.

10855209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3618406.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 10855209 is about 3294.7244194318. The cubic root of 10855209 is about 221.4179012152.

The spelling of 10855209 in words is "ten million, eight hundred fifty-five thousand, two hundred nine".