194855809 has 4 divisors (see below), whose sum is σ = 194913216. Its totient is φ = 194798404.

The previous prime is 194855807. The next prime is 194855827. The reversal of 194855809 is 908558491.

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 a cyclic number.

It is not a de Polignac number, because 194855809 - 2¹ = 194855807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194855807) 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 in 3 ways as a sum of consecutive naturals, for example, 23269 + ... + 30514.

It is an arithmetic number, because the mean of its divisors is an integer number (48728304).

Almost surely, 2^194855809 is an apocalyptic number.

It is an amenable number.

194855809 is a deficient number, since it is larger than the sum of its proper divisors (57407).

194855809 is an equidigital number, since it uses as much as digits as its factorization.

194855809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57406.

The product of its (nonzero) digits is 518400, while the sum is 49.

The square root of 194855809 is about 13959.0762230171. The cubic root of 194855809 is about 579.7460332818.

The spelling of 194855809 in words is "one hundred ninety-four million, eight hundred fifty-five thousand, eight hundred nine".