89661221 has 8 divisors (see below), whose sum is σ = 96644184. Its totient is φ = 82690560.

The previous prime is 89661211. The next prime is 89661227. The reversal of 89661221 is 12216698.

It can be written as a sum of positive squares in 4 ways, for example, as 264196 + 89397025 = 514^2 + 9455^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-89661221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89661227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16925 + ... + 21581.

It is an arithmetic number, because the mean of its divisors is an integer number (12080523).

Almost surely, 2^89661221 is an apocalyptic number.

It is an amenable number.

89661221 is a deficient number, since it is larger than the sum of its proper divisors (6982963).

89661221 is a wasteful number, since it uses less digits than its factorization.

89661221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6151.

The product of its digits is 10368, while the sum is 35.

The square root of 89661221 is about 9468.9609250435. The cubic root of 89661221 is about 447.5774691885.

The spelling of 89661221 in words is "eighty-nine million, six hundred sixty-one thousand, two hundred twenty-one".