18117101 has 2 divisors, whose sum is σ = 18117102. Its totient is φ = 18117100.

The previous prime is 18117041. The next prime is 18117119. The reversal of 18117101 is 10171181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 561001 = 4190^2 + 749^2 .

It is an emirp because it is prime and its reverse (10171181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18117101 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18117191) 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, 9058550 + 9058551.

It is an arithmetic number, because the mean of its divisors is an integer number (9058551).

Almost surely, 2^18117101 is an apocalyptic number.

It is an amenable number.

18117101 is a deficient number, since it is larger than the sum of its proper divisors (1).

18117101 is an equidigital number, since it uses as much as digits as its factorization.

18117101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 20.

The square root of 18117101 is about 4256.4187998833. The cubic root of 18117101 is about 262.6412289162.

Adding to 18117101 its reverse (10171181), we get a palindrome (28288282).

The spelling of 18117101 in words is "eighteen million, one hundred seventeen thousand, one hundred one".