18581113 has 2 divisors, whose sum is σ = 18581114. Its totient is φ = 18581112.

The previous prime is 18581099. The next prime is 18581191. The reversal of 18581113 is 31118581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17749369 + 831744 = 4213^2 + 912^2 .

It is a cyclic number.

It is not a de Polignac number, because 18581113 - 2¹³ = 18572921 is a prime.

It is not a weakly prime, because it can be changed into another prime (18581413) 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, 9290556 + 9290557.

It is an arithmetic number, because the mean of its divisors is an integer number (9290557).

Almost surely, 2^18581113 is an apocalyptic number.

It is an amenable number.

18581113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18581113 is an equidigital number, since it uses as much as digits as its factorization.

18581113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 28.

The square root of 18581113 is about 4310.5815152947. The cubic root of 18581113 is about 264.8645944057.

Adding to 18581113 its reverse (31118581), we get a palindrome (49699694).

The spelling of 18581113 in words is "eighteen million, five hundred eighty-one thousand, one hundred thirteen".