18973159 has 2 divisors, whose sum is σ = 18973160. Its totient is φ = 18973158.

The previous prime is 18973151. The next prime is 18973181. The reversal of 18973159 is 95137981.

It is a weak prime.

It is an emirp because it is prime and its reverse (95137981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18973159 - 2³ = 18973151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18973151) 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, 9486579 + 9486580.

It is an arithmetic number, because the mean of its divisors is an integer number (9486580).

Almost surely, 2^18973159 is an apocalyptic number.

18973159 is a deficient number, since it is larger than the sum of its proper divisors (1).

18973159 is an equidigital number, since it uses as much as digits as its factorization.

18973159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 43.

The square root of 18973159 is about 4355.8189815464. The cubic root of 18973159 is about 266.7144520269.

The spelling of 18973159 in words is "eighteen million, nine hundred seventy-three thousand, one hundred fifty-nine".