18342161 has 2 divisors, whose sum is σ = 18342162. Its totient is φ = 18342160.

The previous prime is 18342143. The next prime is 18342169. The reversal of 18342161 is 16124381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18011536 + 330625 = 4244^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 18342161 - 2¹⁴ = 18325777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18342161.

It is not a weakly prime, because it can be changed into another prime (18342169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9171080 + 9171081.

It is an arithmetic number, because the mean of its divisors is an integer number (9171081).

Almost surely, 2^18342161 is an apocalyptic number.

It is an amenable number.

18342161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18342161 is an equidigital number, since it uses as much as digits as its factorization.

18342161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 18342161 is about 4282.7749182043. The cubic root of 18342161 is about 263.7243114174.

The spelling of 18342161 in words is "eighteen million, three hundred forty-two thousand, one hundred sixty-one".