18110861 has 2 divisors, whose sum is σ = 18110862. Its totient is φ = 18110860.

The previous prime is 18110843. The next prime is 18110879. The reversal of 18110861 is 16801181.

It is a balanced prime because it is at equal distance from previous prime (18110843) and next prime (18110879).

It can be written as a sum of positive squares in only one way, i.e., 14478025 + 3632836 = 3805^2 + 1906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18110861 is a prime.

It is a super-2 number, since 2×18110861² = 656006572322642, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18110861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18110161) 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, 9055430 + 9055431.

It is an arithmetic number, because the mean of its divisors is an integer number (9055431).

Almost surely, 2^18110861 is an apocalyptic number.

It is an amenable number.

18110861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18110861 is an equidigital number, since it uses as much as digits as its factorization.

18110861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 26.

The square root of 18110861 is about 4255.6857261786. The cubic root of 18110861 is about 262.6110719674.

The spelling of 18110861 in words is "eighteen million, one hundred ten thousand, eight hundred sixty-one".