55381209 has 8 divisors (see below), whose sum is σ = 79521792. Its totient is φ = 34080720.

The previous prime is 55381177. The next prime is 55381211. The reversal of 55381209 is 90218355.

55381209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55381209 - 2⁵ = 55381177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55381209.

It is not an unprimeable number, because it can be changed into a prime (55381009) 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 7 ways as a sum of consecutive naturals, for example, 709977 + ... + 710054.

It is an arithmetic number, because the mean of its divisors is an integer number (9940224).

Almost surely, 2^55381209 is an apocalyptic number.

It is an amenable number.

55381209 is a deficient number, since it is larger than the sum of its proper divisors (24140583).

55381209 is a wasteful number, since it uses less digits than its factorization.

55381209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1420047.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 55381209 is about 7441.8552122438. The cubic root of 55381209 is about 381.1718419377.

The spelling of 55381209 in words is "fifty-five million, three hundred eighty-one thousand, two hundred nine".