18203441 has 2 divisors, whose sum is σ = 18203442. Its totient is φ = 18203440.

The previous prime is 18203411. The next prime is 18203459. The reversal of 18203441 is 14430281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12816400 + 5387041 = 3580^2 + 2321^2 .

It is an emirp because it is prime and its reverse (14430281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18203441 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18203401) 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 as a sum of consecutive naturals, namely, 9101720 + 9101721.

It is an arithmetic number, because the mean of its divisors is an integer number (9101721).

Almost surely, 2^18203441 is an apocalyptic number.

It is an amenable number.

18203441 is a deficient number, since it is larger than the sum of its proper divisors (1).

18203441 is an equidigital number, since it uses as much as digits as its factorization.

18203441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 18203441 is about 4266.5490739004. The cubic root of 18203441 is about 263.0577877614.

The spelling of 18203441 in words is "eighteen million, two hundred three thousand, four hundred forty-one".