891593 has 2 divisors, whose sum is σ = 891594. Its totient is φ = 891592.

The previous prime is 891587. The next prime is 891601. The reversal of 891593 is 395198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 466489 + 425104 = 683^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 891593 - 2⁴ = 891577 is a prime.

It is not a weakly prime, because it can be changed into another prime (891523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445796 + 445797.

It is an arithmetic number, because the mean of its divisors is an integer number (445797).

2⁸⁹¹⁵⁹³ is an apocalyptic number.

It is an amenable number.

891593 is a deficient number, since it is larger than the sum of its proper divisors (1).

891593 is an equidigital number, since it uses as much as digits as its factorization.

891593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 891593 is about 944.2420240595. The cubic root of 891593 is about 96.2473727286.

The spelling of 891593 in words is "eight hundred ninety-one thousand, five hundred ninety-three".