891220168 has 8 divisors (see below), whose sum is σ = 1671037830. Its totient is φ = 445610080.

The previous prime is 891220133. The next prime is 891220201. The reversal of 891220168 is 861022198.

891220168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 563682564 + 327537604 = 23742^2 + 18098^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55701253 + ... + 55701268.

Almost surely, 2^891220168 is an apocalyptic number.

It is an amenable number.

891220168 is a deficient number, since it is larger than the sum of its proper divisors (779817662).

891220168 is a wasteful number, since it uses less digits than its factorization.

891220168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111402527 (or 111402523 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 891220168 is about 29853.3108381633. The cubic root of 891220168 is about 962.3395513286.

The spelling of 891220168 in words is "eight hundred ninety-one million, two hundred twenty thousand, one hundred sixty-eight".