805013891 has 8 divisors (see below), whose sum is σ = 878510784. Its totient is φ = 731569320.

The previous prime is 805013863. The next prime is 805013893. The reversal of 805013891 is 198310508.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 805013891 - 2⁶ = 805013827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805013893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23576 + ... + 46538.

It is an arithmetic number, because the mean of its divisors is an integer number (109813848).

Almost surely, 2^805013891 is an apocalyptic number.

805013891 is a deficient number, since it is larger than the sum of its proper divisors (73496893).

805013891 is a wasteful number, since it uses less digits than its factorization.

805013891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26161.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 805013891 is about 28372.7667138755. The cubic root of 805013891 is about 930.2530975685.

The spelling of 805013891 in words is "eight hundred five million, thirteen thousand, eight hundred ninety-one".