821168985 has 32 divisors (see below), whose sum is σ = 1617073920. Its totient is φ = 346514688.

The previous prime is 821168927. The next prime is 821168987. The reversal of 821168985 is 589861128.

It is not a de Polignac number, because 821168985 - 2⁶ = 821168921 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (821168987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299430 + ... + 302159.

It is an arithmetic number, because the mean of its divisors is an integer number (50533560).

Almost surely, 2^821168985 is an apocalyptic number.

It is an amenable number.

821168985 is a deficient number, since it is larger than the sum of its proper divisors (795904935).

821168985 is a wasteful number, since it uses less digits than its factorization.

821168985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601617.

The product of its digits is 276480, while the sum is 48.

The square root of 821168985 is about 28656.0462206495. The cubic root of 821168985 is about 936.4347309850.

The spelling of 821168985 in words is "eight hundred twenty-one million, one hundred sixty-eight thousand, nine hundred eighty-five".