891485885 has 4 divisors (see below), whose sum is σ = 1069783068. Its totient is φ = 713188704.

The previous prime is 891485867. The next prime is 891485891. The reversal of 891485885 is 588584198.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 574752676 + 316733209 = 23974^2 + 17797^2 .

It is a cyclic number.

It is not a de Polignac number, because 891485885 - 2⁸ = 891485629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 891485885.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89148584 + ... + 89148593.

It is an arithmetic number, because the mean of its divisors is an integer number (267445767).

Almost surely, 2^891485885 is an apocalyptic number.

It is an amenable number.

891485885 is a deficient number, since it is larger than the sum of its proper divisors (178297183).

891485885 is a wasteful number, since it uses less digits than its factorization.

891485885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178297182.

The product of its digits is 3686400, while the sum is 56.

The square root of 891485885 is about 29857.7608838975. The cubic root of 891485885 is about 962.4351822320.

The spelling of 891485885 in words is "eight hundred ninety-one million, four hundred eighty-five thousand, eight hundred eighty-five".