1994118817 has 2 divisors, whose sum is σ = 1994118818. Its totient is φ = 1994118816.

The previous prime is 1994118787. The next prime is 1994118823. The reversal of 1994118817 is 7188114991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1887120481 + 106998336 = 43441^2 + 10344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994118817 - 2⁷ = 1994118689 is a prime.

It is a super-3 number, since 3×1994118817³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1994118827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997059408 + 997059409.

It is an arithmetic number, because the mean of its divisors is an integer number (997059409).

Almost surely, 2^1994118817 is an apocalyptic number.

It is an amenable number.

1994118817 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994118817 is an equidigital number, since it uses as much as digits as its factorization.

1994118817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 49.

The square root of 1994118817 is about 44655.5575152746. The cubic root of 1994118817 is about 1258.6848663550.

The spelling of 1994118817 in words is "one billion, nine hundred ninety-four million, one hundred eighteen thousand, eight hundred seventeen".