891011 has 4 divisors (see below), whose sum is σ = 972024. Its totient is φ = 810000.

The previous prime is 891001. The next prime is 891017. The reversal of 891011 is 110198.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891011 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 (891017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40490 + ... + 40511.

It is an arithmetic number, because the mean of its divisors is an integer number (243006).

2⁸⁹¹⁰¹¹ is an apocalyptic number.

891011 is a deficient number, since it is larger than the sum of its proper divisors (81013).

891011 is a wasteful number, since it uses less digits than its factorization.

891011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81012.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 891011 is about 943.9337900510. The cubic root of 891011 is about 96.2264258901.

It can be divided in two parts, 8 and 91011, that added together give a palindrome (91019).

The spelling of 891011 in words is "eight hundred ninety-one thousand, eleven".