811894813 has 2 divisors, whose sum is σ = 811894814. Its totient is φ = 811894812.

The previous prime is 811894807. The next prime is 811894829. The reversal of 811894813 is 318498118.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661415524 + 150479289 = 25718^2 + 12267^2 .

It is a cyclic number.

It is not a de Polignac number, because 811894813 - 2²⁹ = 275023901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 811894813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811894883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405947406 + 405947407.

It is an arithmetic number, because the mean of its divisors is an integer number (405947407).

Almost surely, 2^811894813 is an apocalyptic number.

It is an amenable number.

811894813 is a deficient number, since it is larger than the sum of its proper divisors (1).

811894813 is an equidigital number, since it uses as much as digits as its factorization.

811894813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 43.

The square root of 811894813 is about 28493.7679677504. The cubic root of 811894813 is about 932.8960529687.

The spelling of 811894813 in words is "eight hundred eleven million, eight hundred ninety-four thousand, eight hundred thirteen".