18161573 has 2 divisors, whose sum is σ = 18161574. Its totient is φ = 18161572.

The previous prime is 18161537. The next prime is 18161581. The reversal of 18161573 is 37516181.

Together with previous prime (18161537) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11437924 + 6723649 = 3382^2 + 2593^2 .

It is a cyclic number.

It is not a de Polignac number, because 18161573 - 2⁶ = 18161509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18167573) 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, 9080786 + 9080787.

It is an arithmetic number, because the mean of its divisors is an integer number (9080787).

Almost surely, 2^18161573 is an apocalyptic number.

It is an amenable number.

18161573 is a deficient number, since it is larger than the sum of its proper divisors (1).

18161573 is an equidigital number, since it uses as much as digits as its factorization.

18161573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 32.

The square root of 18161573 is about 4261.6397079059. The cubic root of 18161573 is about 262.8559548932.

The spelling of 18161573 in words is "eighteen million, one hundred sixty-one thousand, five hundred seventy-three".