89844721 has 2 divisors, whose sum is σ = 89844722. Its totient is φ = 89844720.

The previous prime is 89844709. The next prime is 89844743. The reversal of 89844721 is 12744898.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83539600 + 6305121 = 9140^2 + 2511^2 .

It is a cyclic number.

It is not a de Polignac number, because 89844721 - 2¹¹ = 89842673 is a prime.

It is not a weakly prime, because it can be changed into another prime (89844701) 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 as a sum of consecutive naturals, namely, 44922360 + 44922361.

It is an arithmetic number, because the mean of its divisors is an integer number (44922361).

Almost surely, 2^89844721 is an apocalyptic number.

It is an amenable number.

89844721 is a deficient number, since it is larger than the sum of its proper divisors (1).

89844721 is an equidigital number, since it uses as much as digits as its factorization.

89844721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 89844721 is about 9478.6455256012. The cubic root of 89844721 is about 447.8825973851.

The spelling of 89844721 in words is "eighty-nine million, eight hundred forty-four thousand, seven hundred twenty-one".