891009 has 12 divisors (see below), whose sum is σ = 1470976. Its totient is φ = 509112.

The previous prime is 891001. The next prime is 891017. The reversal of 891009 is 900198.

891009 is nontrivially palindromic in base 6.

It is an interprime number because it is at equal distance from previous prime (891001) and next prime (891017).

It is not a de Polignac number, because 891009 - 2³ = 891001 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (891001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7009 + ... + 7134.

2⁸⁹¹⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

891009 is a deficient number, since it is larger than the sum of its proper divisors (579967).

891009 is a wasteful number, since it uses less digits than its factorization.

891009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14156 (or 14153 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 891009 is about 943.9327306540. The cubic root of 891009 is about 96.2263538922.

The spelling of 891009 in words is "eight hundred ninety-one thousand, nine".