891321040123198 has 4 divisors (see below), whose sum is σ = 1336981560184800. Its totient is φ = 445660520061598.

The previous prime is 891321040123067. The next prime is 891321040123271.

891321040123198 is nontrivially palindromic in base 10.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222830260030798 + ... + 222830260030801.

It is an arithmetic number, because the mean of its divisors is an integer number (334245390046200).

Almost surely, 2^{891321040123198} is an apocalyptic number.

891321040123198 is a deficient number, since it is larger than the sum of its proper divisors (445660520061602).

891321040123198 is a wasteful number, since it uses less digits than its factorization.

891321040123198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445660520061601.

The product of its (nonzero) digits is 746496, while the sum is 52.

The spelling of 891321040123198 in words is "eight hundred ninety-one trillion, three hundred twenty-one billion, forty million, one hundred twenty-three thousand, one hundred ninety-eight".