891638853 has 8 divisors (see below), whose sum is σ = 1358687808. Its totient is φ = 509507904.

The previous prime is 891638837. The next prime is 891638873. The reversal of 891638853 is 358836198.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 891638853 - 2⁴ = 891638837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 891638796 and 891638805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891638873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21229476 + ... + 21229517.

It is an arithmetic number, because the mean of its divisors is an integer number (169835976).

Almost surely, 2^891638853 is an apocalyptic number.

It is an amenable number.

891638853 is a deficient number, since it is larger than the sum of its proper divisors (467048955).

891638853 is a wasteful number, since it uses less digits than its factorization.

891638853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42459003.

The product of its digits is 1244160, while the sum is 51.

The square root of 891638853 is about 29860.3223860694. The cubic root of 891638853 is about 962.4902264257.

The spelling of 891638853 in words is "eight hundred ninety-one million, six hundred thirty-eight thousand, eight hundred fifty-three".