19218049 has 4 divisors (see below), whose sum is σ = 19404736. Its totient is φ = 19031364.

The previous prime is 19218029. The next prime is 19218077. The reversal of 19218049 is 94081291.

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 19218049 - 2¹⁵ = 19185281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19218019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93189 + ... + 93394.

It is an arithmetic number, because the mean of its divisors is an integer number (4851184).

Almost surely, 2^19218049 is an apocalyptic number.

It is an amenable number.

19218049 is a deficient number, since it is larger than the sum of its proper divisors (186687).

19218049 is a wasteful number, since it uses less digits than its factorization.

19218049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186686.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 19218049 is about 4383.8395271725. The cubic root of 19218049 is about 267.8570606662.

The spelling of 19218049 in words is "nineteen million, two hundred eighteen thousand, forty-nine".