18182141 has 2 divisors, whose sum is σ = 18182142. Its totient is φ = 18182140.

The previous prime is 18182137. The next prime is 18182149. The reversal of 18182141 is 14128181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13468900 + 4713241 = 3670^2 + 2171^2 .

It is an emirp because it is prime and its reverse (14128181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18182141 - 2² = 18182137 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18182141.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18182149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9091070 + 9091071.

It is an arithmetic number, because the mean of its divisors is an integer number (9091071).

Almost surely, 2^18182141 is an apocalyptic number.

It is an amenable number.

18182141 is a deficient number, since it is larger than the sum of its proper divisors (1).

18182141 is an equidigital number, since it uses as much as digits as its factorization.

18182141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 512, while the sum is 26.

The square root of 18182141 is about 4264.0521807314. The cubic root of 18182141 is about 262.9551456707.

The spelling of 18182141 in words is "eighteen million, one hundred eighty-two thousand, one hundred forty-one".