18145117 has 2 divisors, whose sum is σ = 18145118. Its totient is φ = 18145116.

The previous prime is 18145109. The next prime is 18145123. The reversal of 18145117 is 71154181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17522596 + 622521 = 4186^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 18145117 - 2³ = 18145109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18145147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9072558 + 9072559.

It is an arithmetic number, because the mean of its divisors is an integer number (9072559).

Almost surely, 2^18145117 is an apocalyptic number.

It is an amenable number.

18145117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18145117 is an equidigital number, since it uses as much as digits as its factorization.

18145117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1120, while the sum is 28.

The square root of 18145117 is about 4259.7085581058. The cubic root of 18145117 is about 262.7765406138.

Adding to 18145117 its reverse (71154181), we get a palindrome (89299298).

The spelling of 18145117 in words is "eighteen million, one hundred forty-five thousand, one hundred seventeen".