1994118689 has 2 divisors, whose sum is σ = 1994118690. Its totient is φ = 1994118688.

The previous prime is 1994118671. The next prime is 1994118719. The reversal of 1994118689 is 9868114991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1063868689 + 930250000 = 32617^2 + 30500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1994118689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1994118629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997059344 + 997059345.

It is an arithmetic number, because the mean of its divisors is an integer number (997059345).

Almost surely, 2^1994118689 is an apocalyptic number.

It is an amenable number.

1994118689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994118689 is an equidigital number, since it uses as much as digits as its factorization.

1994118689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 56.

The square root of 1994118689 is about 44655.5560820823. The cubic root of 1994118689 is about 1258.6848394238.

The spelling of 1994118689 in words is "one billion, nine hundred ninety-four million, one hundred eighteen thousand, six hundred eighty-nine".