89661681 has 8 divisors (see below), whose sum is σ = 132832160. Its totient is φ = 59774436.

The previous prime is 89661679. The next prime is 89661709. The reversal of 89661681 is 18616698.

It is a happy number.

It is not a de Polignac number, because 89661681 - 2¹ = 89661679 is a prime.

It is a super-2 number, since 2×89661681² = 16078434079491522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (89661631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1660375 + ... + 1660428.

It is an arithmetic number, because the mean of its divisors is an integer number (16604020).

Almost surely, 2^89661681 is an apocalyptic number.

It is an amenable number.

89661681 is a deficient number, since it is larger than the sum of its proper divisors (43170479).

89661681 is a wasteful number, since it uses less digits than its factorization.

89661681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320812 (or 3320806 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 89661681 is about 9468.9852149003. The cubic root of 89661681 is about 447.5782346078.

The spelling of 89661681 in words is "eighty-nine million, six hundred sixty-one thousand, six hundred eighty-one".