18111013 has 2 divisors, whose sum is σ = 18111014. Its totient is φ = 18111012.

The previous prime is 18111011. The next prime is 18111029. The reversal of 18111013 is 31011181.

It is an a-pointer prime, because the next prime (18111029) can be obtained adding 18111013 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17698849 + 412164 = 4207^2 + 642^2 .

It is an emirp because it is prime and its reverse (31011181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18111013 - 2¹ = 18111011 is a prime.

Together with 18111011, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18111011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9055506 + 9055507.

It is an arithmetic number, because the mean of its divisors is an integer number (9055507).

Almost surely, 2^18111013 is an apocalyptic number.

It is an amenable number.

18111013 is a deficient number, since it is larger than the sum of its proper divisors (1).

18111013 is an equidigital number, since it uses as much as digits as its factorization.

18111013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

The square root of 18111013 is about 4255.7035846027. The cubic root of 18111013 is about 262.6118066420.

Adding to 18111013 its reverse (31011181), we get a palindrome (49122194).

The spelling of 18111013 in words is "eighteen million, one hundred eleven thousand, thirteen".