989657681 has 8 divisors (see below), whose sum is σ = 1016208960. Its totient is φ = 963432432.

The previous prime is 989657677. The next prime is 989657699. The reversal of 989657681 is 186756989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 989657681 - 2² = 989657677 is a prime.

It is a super-2 number, since 2×989657681² = 1958844651124595522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 989657681.

It is not an unprimeable number, because it can be changed into a prime (989657281) 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 in 7 ways as a sum of consecutive naturals, for example, 75350 + ... + 87503.

It is an arithmetic number, because the mean of its divisors is an integer number (127026120).

Almost surely, 2^989657681 is an apocalyptic number.

It is an amenable number.

989657681 is a deficient number, since it is larger than the sum of its proper divisors (26551279).

989657681 is a wasteful number, since it uses less digits than its factorization.

989657681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163015.

The product of its digits is 6531840, while the sum is 59.

The square root of 989657681 is about 31458.8251687821. The cubic root of 989657681 is about 996.5406067315.

The spelling of 989657681 in words is "nine hundred eighty-nine million, six hundred fifty-seven thousand, six hundred eighty-one".