89921 has 4 divisors (see below), whose sum is σ = 96852.
Its totient is φ = 82992.
The previous prime is 89917. The next prime is 89923. The reversal of 89921 is 12998.
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 34225 + 55696 = 185^2 + 236^2
It is not a de Polignac number, because 89921 - 22 = 89917 is a prime.
It is a Duffinian number.
It is a plaindrome in base 14.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 89921.
It is not an unprimeable number, because it can be changed into a prime (89923) 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, 3446 + ... + 3471.
It is an arithmetic number, because the mean of its divisors is an integer number (24213).
289921 is an apocalyptic number.
It is an amenable number.
89921 is a deficient number, since it is larger than the sum of its proper divisors (6931).
89921 is a wasteful number, since it uses less digits than its factorization.
89921 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6930.
The product of its digits is 1296, while the sum is 29.
The square root of 89921 is about 299.8683044271.
The cubic root of 89921 is about 44.8009313688.
The spelling of 89921 in words is "eighty-nine thousand, nine hundred twenty-one".