891111121111198 has 64 divisors (see below), whose sum is σ = 1552224285218880. Its totient is φ = 380128087987200.

The previous prime is 891111121111187. The next prime is 891111121111259.

891111121111198 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2395396368 + ... + 2395768348.

It is an arithmetic number, because the mean of its divisors is an integer number (24253504456545).

Almost surely, 2^{891111121111198} is an apocalyptic number.

891111121111198 is a deficient number, since it is larger than the sum of its proper divisors (661113164107682).

891111121111198 is a wasteful number, since it uses less digits than its factorization.

891111121111198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490333.

The product of its digits is 10368, while the sum is 46.

The spelling of 891111121111198 in words is "eight hundred ninety-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred eleven thousand, one hundred ninety-eight".