618891 has 16 divisors (see below), whose sum is σ = 1016064. Its totient is φ = 326304.

The previous prime is 618883. The next prime is 618913. The reversal of 618891 is 198816.

618891 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 618891 - 2³ = 618883 is a prime.

It is an Ulam number.

618891 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (618841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 861 + ... + 1406.

It is an arithmetic number, because the mean of its divisors is an integer number (63504).

2⁶¹⁸⁸⁹¹ is an apocalyptic number.

618891 is a deficient number, since it is larger than the sum of its proper divisors (397173).

618891 is a wasteful number, since it uses less digits than its factorization.

618891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290.

The product of its digits is 3456, while the sum is 33.

The square root of 618891 is about 786.6962565056. The cubic root of 618891 is about 85.2193182847.

The spelling of 618891 in words is "six hundred eighteen thousand, eight hundred ninety-one".