891020198 has 8 divisors (see below), whose sum is σ = 1336659408. Its totient is φ = 445467064.

The previous prime is 891020171. The next prime is 891020209.

891020198 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 21815 + ... + 47517.

It is an arithmetic number, because the mean of its divisors is an integer number (167082426).

Almost surely, 2^891020198 is an apocalyptic number.

891020198 is a deficient number, since it is larger than the sum of its proper divisors (445639210).

891020198 is a wasteful number, since it uses less digits than its factorization.

891020198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43038.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 891020198 is about 29849.9614405111. The cubic root of 891020198 is about 962.2675700749.

The spelling of 891020198 in words is "eight hundred ninety-one million, twenty thousand, one hundred ninety-eight".