54209809 has 4 divisors (see below), whose sum is σ = 54276660. Its totient is φ = 54142960.

The previous prime is 54209803. The next prime is 54209833. The reversal of 54209809 is 90890245.

54209809 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.

It can be written as a sum of positive squares in 2 ways, for example, as 5419584 + 48790225 = 2328^2 + 6985^2 .

It is a cyclic number.

It is not a de Polignac number, because 54209809 - 2¹¹ = 54207761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54209803) 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, 32194 + ... + 33835.

It is an arithmetic number, because the mean of its divisors is an integer number (13569165).

Almost surely, 2^54209809 is an apocalyptic number.

It is an amenable number.

54209809 is a deficient number, since it is larger than the sum of its proper divisors (66851).

54209809 is an equidigital number, since it uses as much as digits as its factorization.

54209809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66850.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 54209809 is about 7362.7310829610. The cubic root of 54209809 is about 378.4652060013.

The spelling of 54209809 in words is "fifty-four million, two hundred nine thousand, eight hundred nine".