891493 has 2 divisors, whose sum is σ = 891494. Its totient is φ = 891492.

The previous prime is 891491. The next prime is 891509. The reversal of 891493 is 394198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777924 + 113569 = 882^2 + 337^2 .

It is a cyclic number.

It is not a de Polignac number, because 891493 - 2¹ = 891491 is a prime.

Together with 891491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891491) 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, 445746 + 445747.

It is an arithmetic number, because the mean of its divisors is an integer number (445747).

2⁸⁹¹⁴⁹³ is an apocalyptic number.

It is an amenable number.

891493 is a deficient number, since it is larger than the sum of its proper divisors (1).

891493 is an equidigital number, since it uses as much as digits as its factorization.

891493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 891493 is about 944.1890700490. The cubic root of 891493 is about 96.2437742642.

The spelling of 891493 in words is "eight hundred ninety-one thousand, four hundred ninety-three".