18512113 has 2 divisors, whose sum is σ = 18512114. Its totient is φ = 18512112.

The previous prime is 18512111. The next prime is 18512161. The reversal of 18512113 is 31121581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11075584 + 7436529 = 3328^2 + 2727^2 .

It is a cyclic number.

It is not a de Polignac number, because 18512113 - 2¹ = 18512111 is a prime.

Together with 18512111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18512111) 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, 9256056 + 9256057.

It is an arithmetic number, because the mean of its divisors is an integer number (9256057).

Almost surely, 2^18512113 is an apocalyptic number.

It is an amenable number.

18512113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18512113 is an equidigital number, since it uses as much as digits as its factorization.

18512113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 22.

The square root of 18512113 is about 4302.5705107528. The cubic root of 18512113 is about 264.5363340964.

Adding to 18512113 its reverse (31121581), we get a palindrome (49633694).

The spelling of 18512113 in words is "eighteen million, five hundred twelve thousand, one hundred thirteen".