811933 has 2 divisors, whose sum is σ = 811934. Its totient is φ = 811932.

The previous prime is 811931. The next prime is 811957. The reversal of 811933 is 339118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 544644 + 267289 = 738^2 + 517^2 .

It is a cyclic number.

It is not a de Polignac number, because 811933 - 2¹ = 811931 is a prime.

Together with 811931, it forms a pair of twin primes.

811933 is a lucky number.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 811898 and 811907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (811931) 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, 405966 + 405967.

It is an arithmetic number, because the mean of its divisors is an integer number (405967).

2⁸¹¹⁹³³ is an apocalyptic number.

It is an amenable number.

811933 is a deficient number, since it is larger than the sum of its proper divisors (1).

811933 is an equidigital number, since it uses as much as digits as its factorization.

811933 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 25.

The square root of 811933 is about 901.0732489648. The cubic root of 811933 is about 93.2910678814.

The spelling of 811933 in words is "eight hundred eleven thousand, nine hundred thirty-three".