891321 has 8 divisors (see below), whose sum is σ = 1195200. Its totient is φ = 590832.

The previous prime is 891311. The next prime is 891323. The reversal of 891321 is 123198.

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

It is not a de Polignac number, because 891321 - 2⁹ = 890809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 891291 and 891300.

It is not an unprimeable number, because it can be changed into a prime (891323) 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, 150 + ... + 1343.

It is an arithmetic number, because the mean of its divisors is an integer number (149400).

2⁸⁹¹³²¹ is an apocalyptic number.

It is an amenable number.

891321 is a deficient number, since it is larger than the sum of its proper divisors (303879).

891321 is a wasteful number, since it uses less digits than its factorization.

891321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695.

The product of its digits is 432, while the sum is 24.

The square root of 891321 is about 944.0979822031. The cubic root of 891321 is about 96.2375842758.

The spelling of 891321 in words is "eight hundred ninety-one thousand, three hundred twenty-one".