981000089 has 2 divisors, whose sum is σ = 981000090. Its totient is φ = 981000088.

The previous prime is 981000073. The next prime is 981000103. The reversal of 981000089 is 980000189.

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., 732622489 + 248377600 = 27067^2 + 15760^2 .

It is a cyclic number.

It is not a de Polignac number, because 981000089 - 2⁴ = 981000073 is a prime.

It is a super-2 number, since 2×981000089² = 1924722349236015842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (981000029) 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, 490500044 + 490500045.

It is an arithmetic number, because the mean of its divisors is an integer number (490500045).

Almost surely, 2^981000089 is an apocalyptic number.

It is an amenable number.

981000089 is a deficient number, since it is larger than the sum of its proper divisors (1).

981000089 is an equidigital number, since it uses as much as digits as its factorization.

981000089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 981000089 is about 31320.9209475073. The cubic root of 981000089 is about 993.6261567701.

The spelling of 981000089 in words is "nine hundred eighty-one million, eighty-nine", and thus it is an aban number.