54785809 has 4 divisors (see below), whose sum is σ = 59000116. Its totient is φ = 50571504.

The previous prime is 54785779. The next prime is 54785831. The reversal of 54785809 is 90858745.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90858745 = 5 ⋅18171749.

It can be written as a sum of positive squares in 2 ways, for example, as 14653584 + 40132225 = 3828^2 + 6335^2 .

It is a cyclic number.

It is not a de Polignac number, because 54785809 - 2⁵ = 54785777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (54785009) 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, 2107134 + ... + 2107159.

It is an arithmetic number, because the mean of its divisors is an integer number (14750029).

Almost surely, 2^54785809 is an apocalyptic number.

It is an amenable number.

54785809 is a deficient number, since it is larger than the sum of its proper divisors (4214307).

54785809 is a wasteful number, since it uses less digits than its factorization.

54785809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4214306.

The product of its (nonzero) digits is 403200, while the sum is 46.

The square root of 54785809 is about 7401.7436459256. The cubic root of 54785809 is about 379.8009322068.

The spelling of 54785809 in words is "fifty-four million, seven hundred eighty-five thousand, eight hundred nine".