805998111 has 4 divisors (see below), whose sum is σ = 1074664152. Its totient is φ = 537332072.

The previous prime is 805998091. The next prime is 805998133. The reversal of 805998111 is 111899508.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 805998111 - 2¹⁴ = 805981727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805991111) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 134333016 + ... + 134333021.

It is an arithmetic number, because the mean of its divisors is an integer number (268666038).

Almost surely, 2^805998111 is an apocalyptic number.

805998111 is a deficient number, since it is larger than the sum of its proper divisors (268666041).

805998111 is a wasteful number, since it uses less digits than its factorization.

805998111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268666040.

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

The square root of 805998111 is about 28390.1058645437. The cubic root of 805998111 is about 930.6320561747.

The spelling of 805998111 in words is "eight hundred five million, nine hundred ninety-eight thousand, one hundred eleven".