811967 has 4 divisors (see below), whose sum is σ = 874440. Its totient is φ = 749496.

The previous prime is 811961. The next prime is 811981. The reversal of 811967 is 769118.

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 811967 - 2¹² = 807871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811961) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 31217 + ... + 31242.

It is an arithmetic number, because the mean of its divisors is an integer number (218610).

2⁸¹¹⁹⁶⁷ is an apocalyptic number.

811967 is a deficient number, since it is larger than the sum of its proper divisors (62473).

811967 is a wasteful number, since it uses less digits than its factorization.

811967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62472.

The product of its digits is 3024, while the sum is 32.

The square root of 811967 is about 901.0921151580. The cubic root of 811967 is about 93.2923700627.

Subtracting from 811967 its reverse (769118), we obtain a square (42849 = 207²).

It can be divided in two parts, 81 and 1967, that added together give a 11-th power (2048 = 2¹¹).

The spelling of 811967 in words is "eight hundred eleven thousand, nine hundred sixty-seven".