811229 has 4 divisors (see below), whose sum is σ = 813120. Its totient is φ = 809340.

The previous prime is 811207. The next prime is 811231. The reversal of 811229 is 922118.

811229 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 922118 = 2 ⋅461059.

It is a cyclic number.

It is not a de Polignac number, because 811229 - 2⁸ = 810973 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811259) 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, 44 + ... + 1274.

It is an arithmetic number, because the mean of its divisors is an integer number (203280).

2⁸¹¹²²⁹ is an apocalyptic number.

It is an amenable number.

811229 is a deficient number, since it is larger than the sum of its proper divisors (1891).

811229 is a wasteful number, since it uses less digits than its factorization.

811229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1890.

The product of its digits is 288, while the sum is 23.

The square root of 811229 is about 900.6825189821. The cubic root of 811229 is about 93.2640968944.

Subtracting 811229 from its reverse (922118), we obtain a square (110889 = 333²).

The spelling of 811229 in words is "eight hundred eleven thousand, two hundred twenty-nine".