18055171 has 2 divisors, whose sum is σ = 18055172. Its totient is φ = 18055170.

The previous prime is 18055159. The next prime is 18055199. The reversal of 18055171 is 17155081.

It is an a-pointer prime, because the next prime (18055199) can be obtained adding 18055171 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18055171 - 2⁷ = 18055043 is a prime.

It is not a weakly prime, because it can be changed into another prime (18055151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9027585 + 9027586.

It is an arithmetic number, because the mean of its divisors is an integer number (9027586).

Almost surely, 2^18055171 is an apocalyptic number.

18055171 is a deficient number, since it is larger than the sum of its proper divisors (1).

18055171 is an equidigital number, since it uses as much as digits as its factorization.

18055171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 18055171 is about 4249.1376772235. The cubic root of 18055171 is about 262.3416235878.

The spelling of 18055171 in words is "eighteen million, fifty-five thousand, one hundred seventy-one".