18663241 has 4 divisors (see below), whose sum is σ = 19118484. Its totient is φ = 18208000.

The previous prime is 18663233. The next prime is 18663257. The reversal of 18663241 is 14236681.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14236681 = 19 ⋅749299.

It can be written as a sum of positive squares in 2 ways, for example, as 846400 + 17816841 = 920^2 + 4221^2 .

It is a cyclic number.

It is not a de Polignac number, because 18663241 - 2³ = 18663233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18663341) 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, 227560 + ... + 227641.

It is an arithmetic number, because the mean of its divisors is an integer number (4779621).

Almost surely, 2^18663241 is an apocalyptic number.

It is an amenable number.

18663241 is a deficient number, since it is larger than the sum of its proper divisors (455243).

18663241 is an equidigital number, since it uses as much as digits as its factorization.

18663241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455242.

The product of its digits is 6912, while the sum is 31.

The square root of 18663241 is about 4320.0973368664. The cubic root of 18663241 is about 265.2542522436.

The spelling of 18663241 in words is "eighteen million, six hundred sixty-three thousand, two hundred forty-one".