18218041 has 2 divisors, whose sum is σ = 18218042. Its totient is φ = 18218040.

The previous prime is 18218029. The next prime is 18218051. The reversal of 18218041 is 14081281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13249600 + 4968441 = 3640^2 + 2229^2 .

It is a cyclic number.

It is not a de Polignac number, because 18218041 - 2¹⁵ = 18185273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18217997 and 18218015.

It is not a weakly prime, because it can be changed into another prime (18218051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9109020 + 9109021.

It is an arithmetic number, because the mean of its divisors is an integer number (9109021).

Almost surely, 2^18218041 is an apocalyptic number.

It is an amenable number.

18218041 is a deficient number, since it is larger than the sum of its proper divisors (1).

18218041 is an equidigital number, since it uses as much as digits as its factorization.

18218041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 18218041 is about 4268.2597156218. The cubic root of 18218041 is about 263.1280971307.

The spelling of 18218041 in words is "eighteen million, two hundred eighteen thousand, forty-one".