811996843 has 4 divisors (see below), whose sum is σ = 927996400. Its totient is φ = 695997288.

The previous prime is 811996817. The next prime is 811996847. The reversal of 811996843 is 348699118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 348699118 = 2 ⋅174349559.

It is not a de Polignac number, because 811996843 - 2⁵ = 811996811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (811996847) 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, 57999768 + ... + 57999781.

It is an arithmetic number, because the mean of its divisors is an integer number (231999100).

Almost surely, 2^811996843 is an apocalyptic number.

811996843 is a deficient number, since it is larger than the sum of its proper divisors (115999557).

811996843 is a wasteful number, since it uses less digits than its factorization.

811996843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115999556.

The product of its digits is 373248, while the sum is 49.

The square root of 811996843 is about 28495.5583030058. The cubic root of 811996843 is about 932.9351300330.

The spelling of 811996843 in words is "eight hundred eleven million, nine hundred ninety-six thousand, eight hundred forty-three".