19218055 has 4 divisors (see below), whose sum is σ = 23061672. Its totient is φ = 15374440.

The previous prime is 19218029. The next prime is 19218077. The reversal of 19218055 is 55081291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55081291 = 443 ⋅124337.

It is not a de Polignac number, because 19218055 - 2⁷ = 19217927 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1921801 + ... + 1921810.

It is an arithmetic number, because the mean of its divisors is an integer number (5765418).

Almost surely, 2^19218055 is an apocalyptic number.

19218055 is a deficient number, since it is larger than the sum of its proper divisors (3843617).

19218055 is an equidigital number, since it uses as much as digits as its factorization.

19218055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3843616.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 19218055 is about 4383.8402115041. The cubic root of 19218055 is about 267.8570885418.

The spelling of 19218055 in words is "nineteen million, two hundred eighteen thousand, fifty-five".