18422861 has 2 divisors, whose sum is σ = 18422862. Its totient is φ = 18422860.

The previous prime is 18422827. The next prime is 18422863. The reversal of 18422861 is 16822481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 866761 = 4190^2 + 931^2 .

It is a cyclic number.

It is not a de Polignac number, because 18422861 - 2⁶ = 18422797 is a prime.

It is a Sophie Germain prime.

Together with 18422863, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18422863) 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, 9211430 + 9211431.

It is an arithmetic number, because the mean of its divisors is an integer number (9211431).

Almost surely, 2^18422861 is an apocalyptic number.

It is an amenable number.

18422861 is a deficient number, since it is larger than the sum of its proper divisors (1).

18422861 is an equidigital number, since it uses as much as digits as its factorization.

18422861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6144, while the sum is 32.

The square root of 18422861 is about 4292.1860397704. The cubic root of 18422861 is about 264.1105148336.

The spelling of 18422861 in words is "eighteen million, four hundred twenty-two thousand, eight hundred sixty-one".