18130681 has 2 divisors, whose sum is σ = 18130682. Its totient is φ = 18130680.

The previous prime is 18130663. The next prime is 18130727. The reversal of 18130681 is 18603181.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15210000 + 2920681 = 3900^2 + 1709^2 .

It is a cyclic number.

It is not a de Polignac number, because 18130681 - 2¹⁷ = 17999609 is a prime.

It is a super-2 number, since 2×18130681² = 657443187047522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18130621) 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, 9065340 + 9065341.

It is an arithmetic number, because the mean of its divisors is an integer number (9065341).

Almost surely, 2^18130681 is an apocalyptic number.

It is an amenable number.

18130681 is a deficient number, since it is larger than the sum of its proper divisors (1).

18130681 is an equidigital number, since it uses as much as digits as its factorization.

18130681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18130681 is about 4258.0137388224. The cubic root of 18130681 is about 262.7068350178.

The spelling of 18130681 in words is "eighteen million, one hundred thirty thousand, six hundred eighty-one".