813475843 has 4 divisors (see below), whose sum is σ = 817605360. Its totient is φ = 809346328.

The previous prime is 813475811. The next prime is 813475879. The reversal of 813475843 is 348574318.

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 813475843 - 2⁵ = 813475811 is a prime.

It is a super-3 number, since 3×813475843³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 813475843.

It is not an unprimeable number, because it can be changed into a prime (813475343) 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, 2064463 + ... + 2064856.

It is an arithmetic number, because the mean of its divisors is an integer number (204401340).

Almost surely, 2^813475843 is an apocalyptic number.

813475843 is a deficient number, since it is larger than the sum of its proper divisors (4129517).

813475843 is a wasteful number, since it uses less digits than its factorization.

813475843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129516.

The product of its digits is 322560, while the sum is 43.

The square root of 813475843 is about 28521.4979094717. The cubic root of 813475843 is about 933.5012135796.

The spelling of 813475843 in words is "eight hundred thirteen million, four hundred seventy-five thousand, eight hundred forty-three".