891022891 has 12 divisors (see below), whose sum is σ = 982263240. Its totient is φ = 801576960.

The previous prime is 891022859. The next prime is 891022901. The reversal of 891022891 is 198220198.

It is not a de Polignac number, because 891022891 - 2⁵ = 891022859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891022991) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99195 + ... + 107803.

It is an arithmetic number, because the mean of its divisors is an integer number (81855270).

Almost surely, 2^891022891 is an apocalyptic number.

891022891 is a deficient number, since it is larger than the sum of its proper divisors (91240349).

891022891 is an equidigital number, since it uses as much as digits as its factorization.

891022891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8814 (or 8717 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 891022891 is about 29850.0065494130. The cubic root of 891022891 is about 962.2685395195.

The spelling of 891022891 in words is "eight hundred ninety-one million, twenty-two thousand, eight hundred ninety-one".