891197086 has 64 divisors (see below), whose sum is σ = 1588870080. Its totient is φ = 370944000.

The previous prime is 891197053. The next prime is 891197089. The reversal of 891197086 is 680791198.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (891197089) 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 31 ways as a sum of consecutive naturals, for example, 3217180 + ... + 3217456.

It is an arithmetic number, because the mean of its divisors is an integer number (24826095).

Almost surely, 2^891197086 is an apocalyptic number.

891197086 is a deficient number, since it is larger than the sum of its proper divisors (697672994).

891197086 is a wasteful number, since it uses less digits than its factorization.

891197086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589.

The product of its (nonzero) digits is 217728, while the sum is 49.

The square root of 891197086 is about 29852.9242453734. The cubic root of 891197086 is about 962.3312432755.

The spelling of 891197086 in words is "eight hundred ninety-one million, one hundred ninety-seven thousand, eighty-six".