18127513 has 2 divisors, whose sum is σ = 18127514. Its totient is φ = 18127512.

The previous prime is 18127511. The next prime is 18127517. The reversal of 18127513 is 31572181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15264649 + 2862864 = 3907^2 + 1692^2 .

It is an emirp because it is prime and its reverse (31572181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18127513 - 2¹ = 18127511 is a prime.

Together with 18127511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18127511) 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, 9063756 + 9063757.

It is an arithmetic number, because the mean of its divisors is an integer number (9063757).

Almost surely, 2^18127513 is an apocalyptic number.

It is an amenable number.

18127513 is a deficient number, since it is larger than the sum of its proper divisors (1).

18127513 is an equidigital number, since it uses as much as digits as its factorization.

18127513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680, while the sum is 28.

The square root of 18127513 is about 4257.6417181346. The cubic root of 18127513 is about 262.6915330786.

Adding to 18127513 its reverse (31572181), we get a palindrome (49699694).

The spelling of 18127513 in words is "eighteen million, one hundred twenty-seven thousand, five hundred thirteen".