989159081 has 2 divisors, whose sum is σ = 989159082. Its totient is φ = 989159080.

The previous prime is 989159077. The next prime is 989159113. The reversal of 989159081 is 180951989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 622053481 + 367105600 = 24941^2 + 19160^2 .

It is an emirp because it is prime and its reverse (180951989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989159081 - 2² = 989159077 is a prime.

It is a super-2 number, since 2×989159081² = 1956871375049529122, 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 (989159011) 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, 494579540 + 494579541.

It is an arithmetic number, because the mean of its divisors is an integer number (494579541).

Almost surely, 2^989159081 is an apocalyptic number.

It is an amenable number.

989159081 is a deficient number, since it is larger than the sum of its proper divisors (1).

989159081 is an equidigital number, since it uses as much as digits as its factorization.

989159081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 50.

The square root of 989159081 is about 31450.8995260867. The cubic root of 989159081 is about 996.3732227215.

The spelling of 989159081 in words is "nine hundred eighty-nine million, one hundred fifty-nine thousand, eighty-one".