813043805 has 8 divisors (see below), whose sum is σ = 1115031552. Its totient is φ = 557515728.

The previous prime is 813043793. The next prime is 813043831. The reversal of 813043805 is 508340318.

It is a happy number.

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

It is not a de Polignac number, because 813043805 - 2⁸ = 813043549 is a prime.

It is a super-2 number, since 2×813043805² = 1322080457697756050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 11614877 + ... + 11614946.

It is an arithmetic number, because the mean of its divisors is an integer number (139378944).

Almost surely, 2^813043805 is an apocalyptic number.

It is an amenable number.

813043805 is a deficient number, since it is larger than the sum of its proper divisors (301987747).

813043805 is a wasteful number, since it uses less digits than its factorization.

813043805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23229835.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 813043805 is about 28513.9230026315. The cubic root of 813043805 is about 933.3359231079.

The spelling of 813043805 in words is "eight hundred thirteen million, forty-three thousand, eight hundred five".