18026161 has 2 divisors, whose sum is σ = 18026162. Its totient is φ = 18026160.

The previous prime is 18026123. The next prime is 18026167. The reversal of 18026161 is 16162081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16451136 + 1575025 = 4056^2 + 1255^2 .

It is a cyclic number.

It is not a de Polignac number, because 18026161 - 2⁹ = 18025649 is a prime.

It is not a weakly prime, because it can be changed into another prime (18026167) 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, 9013080 + 9013081.

It is an arithmetic number, because the mean of its divisors is an integer number (9013081).

Almost surely, 2^18026161 is an apocalyptic number.

It is an amenable number.

18026161 is a deficient number, since it is larger than the sum of its proper divisors (1).

18026161 is an equidigital number, since it uses as much as digits as its factorization.

18026161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 18026161 is about 4245.7226711127. The cubic root of 18026161 is about 262.2010431747.

The spelling of 18026161 in words is "eighteen million, twenty-six thousand, one hundred sixty-one".