8191855 has 16 divisors (see below), whose sum is σ = 11427840. Its totient is φ = 5520672.

The previous prime is 8191853. The next prime is 8191867. The reversal of 8191855 is 5581918.

It is a cyclic number.

It is not a de Polignac number, because 8191855 - 2¹ = 8191853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8191853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82 + ... + 4048.

It is an arithmetic number, because the mean of its divisors is an integer number (714240).

Almost surely, 2^8191855 is an apocalyptic number.

8191855 is a deficient number, since it is larger than the sum of its proper divisors (3235985).

8191855 is a wasteful number, since it uses less digits than its factorization.

8191855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4038.

The product of its digits is 14400, while the sum is 37.

The square root of 8191855 is about 2862.1416806301. The cubic root of 8191855 is about 201.5861785976.

The spelling of 8191855 in words is "eight million, one hundred ninety-one thousand, eight hundred fifty-five".