1994010989 has 2 divisors, whose sum is σ = 1994010990. Its totient is φ = 1994010988.

The previous prime is 1994010973. The next prime is 1994011001. The reversal of 1994010989 is 9890104991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1107758089 + 886252900 = 33283^2 + 29770^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994010989 - 2⁴ = 1994010973 is a prime.

It is a Sophie Germain prime.

1994010989 is a modest number, since divided by 10989 gives 1994 as remainder.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1994010929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997005494 + 997005495.

It is an arithmetic number, because the mean of its divisors is an integer number (997005495).

Almost surely, 2^1994010989 is an apocalyptic number.

It is an amenable number.

1994010989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994010989 is an equidigital number, since it uses as much as digits as its factorization.

1994010989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 50.

The square root of 1994010989 is about 44654.3501688245. The cubic root of 1994010989 is about 1258.6621789877.

The spelling of 1994010989 in words is "one billion, nine hundred ninety-four million, ten thousand, nine hundred eighty-nine".