891151890 has 16 divisors (see below), whose sum is σ = 2138764608. Its totient is φ = 237640496.

The previous prime is 891151873. The next prime is 891151903. The reversal of 891151890 is 98151198.

891151890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14852502 + ... + 14852561.

It is an arithmetic number, because the mean of its divisors is an integer number (133672788).

Almost surely, 2^891151890 is an apocalyptic number.

891151890 is an abundant number, since it is smaller than the sum of its proper divisors (1247612718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

891151890 is a wasteful number, since it uses less digits than its factorization.

891151890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29705073.

The product of its (nonzero) digits is 25920, while the sum is 42.

The square root of 891151890 is about 29852.1672580066. The cubic root of 891151890 is about 962.3149751725.

The spelling of 891151890 in words is "eight hundred ninety-one million, one hundred fifty-one thousand, eight hundred ninety".