18944117 has 2 divisors, whose sum is σ = 18944118. Its totient is φ = 18944116.

The previous prime is 18944063. The next prime is 18944119. The reversal of 18944117 is 71144981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15413476 + 3530641 = 3926^2 + 1879^2 .

It is a cyclic number.

It is not a de Polignac number, because 18944117 - 2⁶ = 18944053 is a prime.

Together with 18944119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18944119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9472058 + 9472059.

It is an arithmetic number, because the mean of its divisors is an integer number (9472059).

Almost surely, 2^18944117 is an apocalyptic number.

It is an amenable number.

18944117 is a deficient number, since it is larger than the sum of its proper divisors (1).

18944117 is an equidigital number, since it uses as much as digits as its factorization.

18944117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 18944117 is about 4352.4840034169. The cubic root of 18944117 is about 266.5782969340.

The spelling of 18944117 in words is "eighteen million, nine hundred forty-four thousand, one hundred seventeen".