891323 has 2 divisors, whose sum is σ = 891324. Its totient is φ = 891322.

The previous prime is 891311. The next prime is 891329. The reversal of 891323 is 323198.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 891323 - 2⁸ = 891067 is a prime.

It is a Sophie Germain prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 891292 and 891301.

It is not a weakly prime, because it can be changed into another prime (891329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445661 + 445662.

It is an arithmetic number, because the mean of its divisors is an integer number (445662).

2⁸⁹¹³²³ is an apocalyptic number.

891323 is a deficient number, since it is larger than the sum of its proper divisors (1).

891323 is an equidigital number, since it uses as much as digits as its factorization.

891323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

The square root of 891323 is about 944.0990414146. The cubic root of 891323 is about 96.2376562570.

The spelling of 891323 in words is "eight hundred ninety-one thousand, three hundred twenty-three".