918891 has 8 divisors (see below), whose sum is σ = 1361360. Its totient is φ = 612576.

The previous prime is 918889. The next prime is 918899. The reversal of 918891 is 198819.

918891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 918891 - 2¹ = 918889 is a prime.

It is a Duffinian number.

918891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (918899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16990 + ... + 17043.

It is an arithmetic number, because the mean of its divisors is an integer number (170170).

2⁹¹⁸⁸⁹¹ is an apocalyptic number.

918891 is a deficient number, since it is larger than the sum of its proper divisors (442469).

918891 is a wasteful number, since it uses less digits than its factorization.

918891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34042 (or 34036 counting only the distinct ones).

The product of its digits is 5184, while the sum is 36.

The square root of 918891 is about 958.5880241272. The cubic root of 918891 is about 97.2197871620.

The spelling of 918891 in words is "nine hundred eighteen thousand, eight hundred ninety-one".