85921 has 8 divisors (see below), whose sum is σ = 95904. Its totient is φ = 76320.

The previous prime is 85909. The next prime is 85931. The reversal of 85921 is 12958.

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

It is a cyclic number.

It is not a de Polignac number, because 85921 - 2⁵ = 85889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750 + ... + 856.

It is an arithmetic number, because the mean of its divisors is an integer number (11988).

2⁸⁵⁹²¹ is an apocalyptic number.

It is an amenable number.

85921 is a deficient number, since it is larger than the sum of its proper divisors (9983).

85921 is a wasteful number, since it uses less digits than its factorization.

85921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191.

The product of its digits is 720, while the sum is 25.

The square root of 85921 is about 293.1228411434. The cubic root of 85921 is about 44.1265297321.

It can be divided in two parts, 8 and 5921, that added together give a square (5929 = 77²).

The spelling of 85921 in words is "eighty-five thousand, nine hundred twenty-one".