55186909 has 4 divisors (see below), whose sum is σ = 55319040. Its totient is φ = 55054780.

The previous prime is 55186907. The next prime is 55186921. The reversal of 55186909 is 90968155.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55186909 - 2¹ = 55186907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55186907) 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, 65437 + ... + 66274.

It is an arithmetic number, because the mean of its divisors is an integer number (13829760).

Almost surely, 2^55186909 is an apocalyptic number.

It is an amenable number.

55186909 is a deficient number, since it is larger than the sum of its proper divisors (132131).

55186909 is a wasteful number, since it uses less digits than its factorization.

55186909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132130.

The product of its (nonzero) digits is 97200, while the sum is 43.

The square root of 55186909 is about 7428.7892014783. The cubic root of 55186909 is about 380.7255505428.

The spelling of 55186909 in words is "fifty-five million, one hundred eighty-six thousand, nine hundred nine".