891322223191 has 2 divisors, whose sum is σ = 891322223192. Its totient is φ = 891322223190.

The previous prime is 891322223189. The next prime is 891322223201. The reversal of 891322223191 is 191322223198.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 891322223191 - 2¹ = 891322223189 is a prime.

Together with 891322223189, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891322223171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445661111595 + 445661111596.

It is an arithmetic number, because the mean of its divisors is an integer number (445661111596).

Almost surely, 2^891322223191 is an apocalyptic number.

891322223191 is a deficient number, since it is larger than the sum of its proper divisors (1).

891322223191 is an equidigital number, since it uses as much as digits as its factorization.

891322223191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The spelling of 891322223191 in words is "eight hundred ninety-one billion, three hundred twenty-two million, two hundred twenty-three thousand, one hundred ninety-one".