805056891 has 4 divisors (see below), whose sum is σ = 1073409192. Its totient is φ = 536704592.

The previous prime is 805056883. The next prime is 805056911. The reversal of 805056891 is 198650508.

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 805056891 - 2³ = 805056883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (805056491) 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, 134176146 + ... + 134176151.

It is an arithmetic number, because the mean of its divisors is an integer number (268352298).

Almost surely, 2^805056891 is an apocalyptic number.

805056891 is a deficient number, since it is larger than the sum of its proper divisors (268352301).

805056891 is a wasteful number, since it uses less digits than its factorization.

805056891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268352300.

The product of its (nonzero) digits is 86400, while the sum is 42.

The square root of 805056891 is about 28373.5244726488. The cubic root of 805056891 is about 930.2696605005.

The spelling of 805056891 in words is "eight hundred five million, fifty-six thousand, eight hundred ninety-one".