55109905 has 4 divisors (see below), whose sum is σ = 66131892. Its totient is φ = 44087920.

The previous prime is 55109893. The next prime is 55109911. The reversal of 55109905 is 50990155.

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 30735936 + 24373969 = 5544^2 + 4937^2 .

It is not a de Polignac number, because 55109905 - 2⁷ = 55109777 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 5510986 + ... + 5510995.

It is an arithmetic number, because the mean of its divisors is an integer number (16532973).

Almost surely, 2^55109905 is an apocalyptic number.

It is an amenable number.

55109905 is a deficient number, since it is larger than the sum of its proper divisors (11021987).

55109905 is a wasteful number, since it uses less digits than its factorization.

55109905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11021986.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 55109905 is about 7423.6045826808. The cubic root of 55109905 is about 380.5483887411.

The spelling of 55109905 in words is "fifty-five million, one hundred nine thousand, nine hundred five".