55512909 has 12 divisors (see below), whose sum is σ = 82772352. Its totient is φ = 35814600.

The previous prime is 55512901. The next prime is 55512911. The reversal of 55512909 is 90921555.

55512909 is a `hidden beast` number, since 55 + 512 + 90 + 9 = 666.

It is not a de Polignac number, because 55512909 - 2³ = 55512901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55512901) 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, 99207 + ... + 99764.

It is an arithmetic number, because the mean of its divisors is an integer number (6897696).

Almost surely, 2^55512909 is an apocalyptic number.

It is an amenable number.

55512909 is a deficient number, since it is larger than the sum of its proper divisors (27259443).

55512909 is a wasteful number, since it uses less digits than its factorization.

55512909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199008 (or 199005 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 36.

The square root of 55512909 is about 7450.6985578535. The cubic root of 55512909 is about 381.4737529516.

The spelling of 55512909 in words is "fifty-five million, five hundred twelve thousand, nine hundred nine".