18071113 has 2 divisors, whose sum is σ = 18071114. Its totient is φ = 18071112.

The previous prime is 18071111. The next prime is 18071143. The reversal of 18071113 is 31117081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11269449 + 6801664 = 3357^2 + 2608^2 .

It is an emirp because it is prime and its reverse (31117081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18071113 - 2¹ = 18071111 is a prime.

Together with 18071111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18071111) 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, 9035556 + 9035557.

It is an arithmetic number, because the mean of its divisors is an integer number (9035557).

Almost surely, 2^18071113 is an apocalyptic number.

It is an amenable number.

18071113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18071113 is an equidigital number, since it uses as much as digits as its factorization.

18071113 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 18071113 is about 4251.0131733506. The cubic root of 18071113 is about 262.4188132905.

Adding to 18071113 its reverse (31117081), we get a palindrome (49188194).

The spelling of 18071113 in words is "eighteen million, seventy-one thousand, one hundred thirteen".