891122011 has 4 divisors (see below), whose sum is σ = 959669872. Its totient is φ = 822574152.

The previous prime is 891121999. The next prime is 891122033. The reversal of 891122011 is 110221198.

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

It is a cyclic number.

It is not a de Polignac number, because 891122011 - 2¹⁷ = 890990939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (891122041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34273911 + ... + 34273936.

It is an arithmetic number, because the mean of its divisors is an integer number (239917468).

Almost surely, 2^891122011 is an apocalyptic number.

891122011 is a deficient number, since it is larger than the sum of its proper divisors (68547861).

891122011 is a wasteful number, since it uses less digits than its factorization.

891122011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68547860.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 891122011 is about 29851.6668043846. Note that the first 3 decimals coincide. The cubic root of 891122011 is about 962.3042200547.

The spelling of 891122011 in words is "eight hundred ninety-one million, one hundred twenty-two thousand, eleven".