805111123 has 4 divisors (see below), whose sum is σ = 818309728. Its totient is φ = 791912520.

The previous prime is 805111093. The next prime is 805111129. The reversal of 805111123 is 321111508.

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 805111123 - 2⁵ = 805111091 is a prime.

It is a super-2 number, since 2×805111123² = 1296407840756642258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 805111094 and 805111103.

It is not an unprimeable number, because it can be changed into a prime (805111129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6599211 + ... + 6599332.

It is an arithmetic number, because the mean of its divisors is an integer number (204577432).

Almost surely, 2^805111123 is an apocalyptic number.

805111123 is a deficient number, since it is larger than the sum of its proper divisors (13198605).

805111123 is a wasteful number, since it uses less digits than its factorization.

805111123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13198604.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 805111123 is about 28374.4801362069. The cubic root of 805111123 is about 930.2905489834.

The spelling of 805111123 in words is "eight hundred five million, one hundred eleven thousand, one hundred twenty-three".