55009905 has 32 divisors (see below), whose sum is σ = 94106880. Its totient is φ = 27371520.

The previous prime is 55009901. The next prime is 55009939. The reversal of 55009905 is 50990055.

55009905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55009905 - 2² = 55009901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55009901) 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 31 ways as a sum of consecutive naturals, for example, 12201 + ... + 16089.

It is an arithmetic number, because the mean of its divisors is an integer number (2940840).

Almost surely, 2^55009905 is an apocalyptic number.

It is an amenable number.

55009905 is a deficient number, since it is larger than the sum of its proper divisors (39096975).

55009905 is a wasteful number, since it uses less digits than its factorization.

55009905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961.

The product of its (nonzero) digits is 10125, while the sum is 33.

The square root of 55009905 is about 7416.8662519962. The cubic root of 55009905 is about 380.3180739447.

The spelling of 55009905 in words is "fifty-five million, nine thousand, nine hundred five".