89244721 has 4 divisors (see below), whose sum is σ = 89395812. Its totient is φ = 89093632.

The previous prime is 89244707. The next prime is 89244733. The reversal of 89244721 is 12744298.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25644096 + 63600625 = 5064^2 + 7975^2 .

It is a cyclic number.

It is not a de Polignac number, because 89244721 - 2²¹ = 87147569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (89244821) 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 3 ways as a sum of consecutive naturals, for example, 74656 + ... + 75841.

It is an arithmetic number, because the mean of its divisors is an integer number (22348953).

Almost surely, 2^89244721 is an apocalyptic number.

It is an amenable number.

89244721 is a deficient number, since it is larger than the sum of its proper divisors (151091).

89244721 is a wasteful number, since it uses less digits than its factorization.

89244721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151090.

The product of its digits is 32256, while the sum is 37.

The square root of 89244721 is about 9446.9424154062. The cubic root of 89244721 is about 446.8833548636.

The spelling of 89244721 in words is "eighty-nine million, two hundred forty-four thousand, seven hundred twenty-one".