18173489 has 2 divisors, whose sum is σ = 18173490. Its totient is φ = 18173488.

The previous prime is 18173483. The next prime is 18173497. The reversal of 18173489 is 98437181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17572864 + 600625 = 4192^2 + 775^2 .

It is an emirp because it is prime and its reverse (98437181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18173489 - 2²⁴ = 1396273 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18173483) 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, 9086744 + 9086745.

It is an arithmetic number, because the mean of its divisors is an integer number (9086745).

Almost surely, 2^18173489 is an apocalyptic number.

It is an amenable number.

18173489 is a deficient number, since it is larger than the sum of its proper divisors (1).

18173489 is an equidigital number, since it uses as much as digits as its factorization.

18173489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 18173489 is about 4263.0375320891. The cubic root of 18173489 is about 262.9134298485.

The spelling of 18173489 in words is "eighteen million, one hundred seventy-three thousand, four hundred eighty-nine".