891098 has 8 divisors (see below), whose sum is σ = 1439508. Its totient is φ = 411264.

The previous prime is 891091. The next prime is 891101. The reversal of 891098 is 890198.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 889249 + 1849 = 943^2 + 43^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (891091) 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 in 3 ways as a sum of consecutive naturals, for example, 17111 + ... + 17162.

2⁸⁹¹⁰⁹⁸ is an apocalyptic number.

891098 is a deficient number, since it is larger than the sum of its proper divisors (548410).

891098 is a wasteful number, since it uses less digits than its factorization.

891098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34288.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 891098 is about 943.9798726668. The cubic root of 891098 is about 96.2295576983.

Subtracting from 891098 its reverse (890198), we obtain a square (900 = 30²).

The spelling of 891098 in words is "eight hundred ninety-one thousand, ninety-eight".