18110381 has 2 divisors, whose sum is σ = 18110382. Its totient is φ = 18110380.

The previous prime is 18110377. The next prime is 18110383. The reversal of 18110381 is 18301181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11526025 + 6584356 = 3395^2 + 2566^2 .

It is a cyclic number.

It is not a de Polignac number, because 18110381 - 2² = 18110377 is a prime.

It is a super-2 number, since 2×18110381² = 655971799930322, which contains 22 as substring.

Together with 18110383, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18110383) 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, 9055190 + 9055191.

It is an arithmetic number, because the mean of its divisors is an integer number (9055191).

Almost surely, 2^18110381 is an apocalyptic number.

It is an amenable number.

18110381 is a deficient number, since it is larger than the sum of its proper divisors (1).

18110381 is an equidigital number, since it uses as much as digits as its factorization.

18110381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 23.

The square root of 18110381 is about 4255.6293306631. The cubic root of 18110381 is about 262.6087519152.

The spelling of 18110381 in words is "eighteen million, one hundred ten thousand, three hundred eighty-one".