89309821 has 4 divisors (see below), whose sum is σ = 92389500. Its totient is φ = 86230144.

The previous prime is 89309777. The next prime is 89309827. The reversal of 89309821 is 12890398.

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 30404196 + 58905625 = 5514^2 + 7675^2 .

It is a cyclic number.

It is not a de Polignac number, because 89309821 - 2⁹ = 89309309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89309827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1539796 + ... + 1539853.

It is an arithmetic number, because the mean of its divisors is an integer number (23097375).

Almost surely, 2^89309821 is an apocalyptic number.

It is an amenable number.

89309821 is a deficient number, since it is larger than the sum of its proper divisors (3079679).

89309821 is a wasteful number, since it uses less digits than its factorization.

89309821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079678.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 89309821 is about 9450.3873465589. The cubic root of 89309821 is about 446.9919888726.

The spelling of 89309821 in words is "eighty-nine million, three hundred nine thousand, eight hundred twenty-one".