989668681 has 9 divisors (see below), whose sum is σ = 1000963719. Its totient is φ = 978500736.

The previous prime is 989668663. The next prime is 989668699. The reversal of 989668681 is 186866989.

The square root of 989668681 is 31459.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (989668663) and next prime (989668699).

It can be written as a sum of positive squares in only one way, i.e., 239785225 + 749883456 = 15485^2 + 27384^2 .

It is not a de Polignac number, because 989668681 - 2⁵ = 989668649 is a prime.

It is a super-2 number, since 2×989668681² = 1958888196304559522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989668621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 5127721 + ... + 5127913.

It is an arithmetic number, because the mean of its divisors is an integer number (111218191).

Almost surely, 2^989668681 is an apocalyptic number.

989668681 is the 31459-th square number.

989668681 is the 15730-th centered octagonal number.

It is an amenable number.

989668681 is a deficient number, since it is larger than the sum of its proper divisors (11295038).

989668681 is an frugal number, since it uses more digits than its factorization.

989668681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 356 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 61.

The cubic root of 989668681 is about 996.5442988857.

The spelling of 989668681 in words is "nine hundred eighty-nine million, six hundred sixty-eight thousand, six hundred eighty-one".