55996209 has 12 divisors (see below), whose sum is σ = 82023552. Its totient is φ = 36804600.

The previous prime is 55996169. The next prime is 55996217. The reversal of 55996209 is 90269955.

55996209 is a `hidden beast` number, since 559 + 96 + 2 + 0 + 9 = 666.

It is not a de Polignac number, because 55996209 - 2¹¹ = 55994161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55996279) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43177 + ... + 44454.

It is an arithmetic number, because the mean of its divisors is an integer number (6835296).

Almost surely, 2^55996209 is an apocalyptic number.

It is an amenable number.

55996209 is a deficient number, since it is larger than the sum of its proper divisors (26027343).

55996209 is a wasteful number, since it uses less digits than its factorization.

55996209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87708 (or 87705 counting only the distinct ones).

The product of its (nonzero) digits is 218700, while the sum is 45.

The square root of 55996209 is about 7483.0614724189. The cubic root of 55996209 is about 382.5776031190.

The spelling of 55996209 in words is "fifty-five million, nine hundred ninety-six thousand, two hundred nine".