891161986 has 32 divisors (see below), whose sum is σ = 1586039616. Its totient is φ = 370200000.

The previous prime is 891161977. The next prime is 891162011. The reversal of 891161986 is 689161198.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13461 + ... + 44311.

It is an arithmetic number, because the mean of its divisors is an integer number (49563738).

Almost surely, 2^891161986 is an apocalyptic number.

891161986 is a deficient number, since it is larger than the sum of its proper divisors (694877630).

891161986 is a wasteful number, since it uses less digits than its factorization.

891161986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30978.

The product of its digits is 186624, while the sum is 49.

The square root of 891161986 is about 29852.3363574780. The cubic root of 891161986 is about 962.3186092313.

The spelling of 891161986 in words is "eight hundred ninety-one million, one hundred sixty-one thousand, nine hundred eighty-six".