18219241 has 4 divisors (see below), whose sum is σ = 18386500. Its totient is φ = 18051984.

The previous prime is 18219203. The next prime is 18219251. The reversal of 18219241 is 14291281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14291281 = 1181 ⋅12101.

It can be written as a sum of positive squares in 2 ways, for example, as 5107600 + 13111641 = 2260^2 + 3621^2 .

It is a cyclic number.

It is not a de Polignac number, because 18219241 - 2⁹ = 18218729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18219251) 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, 83466 + ... + 83683.

It is an arithmetic number, because the mean of its divisors is an integer number (4596625).

Almost surely, 2^18219241 is an apocalyptic number.

It is an amenable number.

18219241 is a deficient number, since it is larger than the sum of its proper divisors (167259).

18219241 is a wasteful number, since it uses less digits than its factorization.

18219241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167258.

The product of its digits is 1152, while the sum is 28.

The square root of 18219241 is about 4268.4002858214. The cubic root of 18219241 is about 263.1338743121.

The spelling of 18219241 in words is "eighteen million, two hundred nineteen thousand, two hundred forty-one".