18243041 has 2 divisors, whose sum is σ = 18243042. Its totient is φ = 18243040.

The previous prime is 18243037. The next prime is 18243047. The reversal of 18243041 is 14034281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18241441 + 1600 = 4271^2 + 40^2 .

It is an emirp because it is prime and its reverse (14034281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18243041 - 2² = 18243037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18242998 and 18243016.

It is not a weakly prime, because it can be changed into another prime (18243047) by changing a digit.

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 as a sum of consecutive naturals, namely, 9121520 + 9121521.

It is an arithmetic number, because the mean of its divisors is an integer number (9121521).

Almost surely, 2^18243041 is an apocalyptic number.

It is an amenable number.

18243041 is a deficient number, since it is larger than the sum of its proper divisors (1).

18243041 is an equidigital number, since it uses as much as digits as its factorization.

18243041 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 18243041 is about 4271.1873056564. The cubic root of 18243041 is about 263.2484027059.

The spelling of 18243041 in words is "eighteen million, two hundred forty-three thousand, forty-one".