1818161 has 2 divisors, whose sum is σ = 1818162. Its totient is φ = 1818160.

The previous prime is 1818151. The next prime is 1818163. The reversal of 1818161 is 1618181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1739761 + 78400 = 1319^2 + 280^2 .

It is an emirp because it is prime and its reverse (1618181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1818161 - 2¹⁴ = 1801777 is a prime.

Together with 1818163, it forms a pair of twin primes.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 1818161.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1818163) 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, 909080 + 909081.

It is an arithmetic number, because the mean of its divisors is an integer number (909081).

2^1818161 is an apocalyptic number.

It is an amenable number.

1818161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818161 is an equidigital number, since it uses as much as digits as its factorization.

1818161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 26.

The square root of 1818161 is about 1348.3920053160. The cubic root of 1818161 is about 122.0517786125.

The spelling of 1818161 in words is "one million, eight hundred eighteen thousand, one hundred sixty-one".